organized_contracts/18/1809072136249b1aa23491b1ca3670dd320cb383b5262ab648c6512a1ee2201c/main.sol

// This contract is part of Zellic’s smart contract dataset, which is a collection of publicly available contract code gathered as of March 2023.

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**

 * @dev Provides information about the current execution context, including the

 * sender of the transaction and its data. While these are generally available

 * via msg.sender and msg.data, they should not be accessed in such a direct

 * manner, since when dealing with meta-transactions the account sending and

 * paying for execution may not be the actual sender (as far as an application

 * is concerned).

 *

 * This contract is only required for intermediate, library-like contracts.

 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableSet.sol)

pragma solidity ^0.8.0;

/**

 * @dev Library for managing

 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive

 * types.

 *

 * Sets have the following properties:

 *

 * - Elements are added, removed, and checked for existence in constant time

 * (O(1)).

 * - Elements are enumerated in O(n). No guarantees are made on the ordering.

 *

 * ```

 * contract Example {

 *     // Add the library methods

 *     using EnumerableSet for EnumerableSet.AddressSet;

 *

 *     // Declare a set state variable

 *     EnumerableSet.AddressSet private mySet;

 * }

 * ```

 *

 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)

 * and `uint256` (`UintSet`) are supported.

 *

 * [WARNING]

 * ====

 *  Trying to delete such a structure from storage will likely result in data corruption, rendering the structure unusable.

 *  See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.

 *

 *  In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an array of EnumerableSet.

 * ====

 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**

     * @dev Add a value to a set. O(1).

     *

     * Returns true if the value was added to the set, that is if it was not

     * already present.

     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**

     * @dev Removes a value from a set. O(1).

     *

     * Returns true if the value was removed from the set, that is if it was

     * present.

     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**

     * @dev Returns true if the value is in the set. O(1).

     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**

     * @dev Returns the number of values on the set. O(1).

     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**

     * @dev Returns the value stored at position `index` in the set. O(1).

     *

     * Note that there are no guarantees on the ordering of values inside the

     * array, and it may change when more values are added or removed.

     *

     * Requirements:

     *

     * - `index` must be strictly less than {length}.

     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**

     * @dev Return the entire set in an array

     *

     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed

     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that

     * this function has an unbounded cost, and using it as part of a state-changing function may render the function

     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.

     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**

     * @dev Add a value to a set. O(1).

     *

     * Returns true if the value was added to the set, that is if it was not

     * already present.

     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**

     * @dev Removes a value from a set. O(1).

     *

     * Returns true if the value was removed from the set, that is if it was

     * present.

     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**

     * @dev Returns true if the value is in the set. O(1).

     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**

     * @dev Returns the number of values in the set. O(1).

     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**

     * @dev Returns the value stored at position `index` in the set. O(1).

     *

     * Note that there are no guarantees on the ordering of values inside the

     * array, and it may change when more values are added or removed.

     *

     * Requirements:

     *

     * - `index` must be strictly less than {length}.

     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**

     * @dev Return the entire set in an array

     *

     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed

     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that

     * this function has an unbounded cost, and using it as part of a state-changing function may render the function

     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.

     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**

     * @dev Add a value to a set. O(1).

     *

     * Returns true if the value was added to the set, that is if it was not

     * already present.

     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**

     * @dev Removes a value from a set. O(1).

     *

     * Returns true if the value was removed from the set, that is if it was

     * present.

     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**

     * @dev Returns true if the value is in the set. O(1).

     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**

     * @dev Returns the number of values in the set. O(1).

     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**

     * @dev Returns the value stored at position `index` in the set. O(1).

     *

     * Note that there are no guarantees on the ordering of values inside the

     * array, and it may change when more values are added or removed.

     *

     * Requirements:

     *

     * - `index` must be strictly less than {length}.

     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**

     * @dev Return the entire set in an array

     *

     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed

     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that

     * this function has an unbounded cost, and using it as part of a state-changing function may render the function

     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.

     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**

     * @dev Add a value to a set. O(1).

     *

     * Returns true if the value was added to the set, that is if it was not

     * already present.

     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**

     * @dev Removes a value from a set. O(1).

     *

     * Returns true if the value was removed from the set, that is if it was

     * present.

     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**

     * @dev Returns true if the value is in the set. O(1).

     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**

     * @dev Returns the number of values on the set. O(1).

     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**

     * @dev Returns the value stored at position `index` in the set. O(1).

     *

     * Note that there are no guarantees on the ordering of values inside the

     * array, and it may change when more values are added or removed.

     *

     * Requirements:

     *

     * - `index` must be strictly less than {length}.

     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**

     * @dev Return the entire set in an array

     *

     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed

     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that

     * this function has an unbounded cost, and using it as part of a state-changing function may render the function

     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.

     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**

 * @dev Interface of the ERC165 standard, as defined in the

 * https://eips.ethereum.org/EIPS/eip-165[EIP].

 *

 * Implementers can declare support of contract interfaces, which can then be

 * queried by others ({ERC165Checker}).

 *

 * For an implementation, see {ERC165}.

 */
interface IERC165 {
    /**

     * @dev Returns true if this contract implements the interface defined by

     * `interfaceId`. See the corresponding

     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]

     * to learn more about how these ids are created.

     *

     * This function call must use less than 30 000 gas.

     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;


/**

 * @dev Implementation of the {IERC165} interface.

 *

 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check

 * for the additional interface id that will be supported. For example:

 *

 * ```solidity

 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {

 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);

 * }

 * ```

 *

 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.

 */
abstract contract ERC165 is IERC165 {
    /**

     * @dev See {IERC165-supportsInterface}.

     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**

 * @dev String operations.

 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**

     * @dev Converts a `uint256` to its ASCII `string` decimal representation.

     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**

     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.

     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**

     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.

     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**

     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.

     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**

 * @dev External interface of AccessControl declared to support ERC165 detection.

 */
interface IAccessControl {
    /**

     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`

     *

     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite

     * {RoleAdminChanged} not being emitted signaling this.

     *

     * _Available since v3.1._

     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**

     * @dev Emitted when `account` is granted `role`.

     *

     * `sender` is the account that originated the contract call, an admin role

     * bearer except when using {AccessControl-_setupRole}.

     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**

     * @dev Emitted when `account` is revoked `role`.

     *

     * `sender` is the account that originated the contract call:

     *   - if using `revokeRole`, it is the admin role bearer

     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)

     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**

     * @dev Returns `true` if `account` has been granted `role`.

     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**

     * @dev Returns the admin role that controls `role`. See {grantRole} and

     * {revokeRole}.

     *

     * To change a role's admin, use {AccessControl-_setRoleAdmin}.

     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**

     * @dev Grants `role` to `account`.

     *

     * If `account` had not been already granted `role`, emits a {RoleGranted}

     * event.

     *

     * Requirements:

     *

     * - the caller must have ``role``'s admin role.

     */
    function grantRole(bytes32 role, address account) external;

    /**

     * @dev Revokes `role` from `account`.

     *

     * If `account` had been granted `role`, emits a {RoleRevoked} event.

     *

     * Requirements:

     *

     * - the caller must have ``role``'s admin role.

     */
    function revokeRole(bytes32 role, address account) external;

    /**

     * @dev Revokes `role` from the calling account.

     *

     * Roles are often managed via {grantRole} and {revokeRole}: this function's

     * purpose is to provide a mechanism for accounts to lose their privileges

     * if they are compromised (such as when a trusted device is misplaced).

     *

     * If the calling account had been granted `role`, emits a {RoleRevoked}

     * event.

     *

     * Requirements:

     *

     * - the caller must be `account`.

     */
    function renounceRole(bytes32 role, address account) external;
}

// OpenZeppelin Contracts (last updated v4.7.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

/**

 * @dev Contract module that allows children to implement role-based access

 * control mechanisms. This is a lightweight version that doesn't allow enumerating role

 * members except through off-chain means by accessing the contract event logs. Some

 * applications may benefit from on-chain enumerability, for those cases see

 * {AccessControlEnumerable}.

 *

 * Roles are referred to by their `bytes32` identifier. These should be exposed

 * in the external API and be unique. The best way to achieve this is by

 * using `public constant` hash digests:

 *

 * ```

 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");

 * ```

 *

 * Roles can be used to represent a set of permissions. To restrict access to a

 * function call, use {hasRole}:

 *

 * ```

 * function foo() public {

 *     require(hasRole(MY_ROLE, msg.sender));

 *     ...

 * }

 * ```

 *

 * Roles can be granted and revoked dynamically via the {grantRole} and

 * {revokeRole} functions. Each role has an associated admin role, and only

 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.

 *

 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means

 * that only accounts with this role will be able to grant or revoke other

 * roles. More complex role relationships can be created by using

 * {_setRoleAdmin}.

 *

 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to

 * grant and revoke this role. Extra precautions should be taken to secure

 * accounts that have been granted it.

 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**

     * @dev Modifier that checks that an account has a specific role. Reverts

     * with a standardized message including the required role.

     *

     * The format of the revert reason is given by the following regular expression:

     *

     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/

     *

     * _Available since v4.1._

     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**

     * @dev See {IERC165-supportsInterface}.

     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**

     * @dev Returns `true` if `account` has been granted `role`.

     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**

     * @dev Revert with a standard message if `_msgSender()` is missing `role`.

     * Overriding this function changes the behavior of the {onlyRole} modifier.

     *

     * Format of the revert message is described in {_checkRole}.

     *

     * _Available since v4.6._

     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**

     * @dev Revert with a standard message if `account` is missing `role`.

     *

     * The format of the revert reason is given by the following regular expression:

     *

     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/

     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**

     * @dev Returns the admin role that controls `role`. See {grantRole} and

     * {revokeRole}.

     *

     * To change a role's admin, use {_setRoleAdmin}.

     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**

     * @dev Grants `role` to `account`.

     *

     * If `account` had not been already granted `role`, emits a {RoleGranted}

     * event.

     *

     * Requirements:

     *

     * - the caller must have ``role``'s admin role.

     *

     * May emit a {RoleGranted} event.

     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**

     * @dev Revokes `role` from `account`.

     *

     * If `account` had been granted `role`, emits a {RoleRevoked} event.

     *

     * Requirements:

     *

     * - the caller must have ``role``'s admin role.

     *

     * May emit a {RoleRevoked} event.

     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**

     * @dev Revokes `role` from the calling account.

     *

     * Roles are often managed via {grantRole} and {revokeRole}: this function's

     * purpose is to provide a mechanism for accounts to lose their privileges

     * if they are compromised (such as when a trusted device is misplaced).

     *

     * If the calling account had been revoked `role`, emits a {RoleRevoked}

     * event.

     *

     * Requirements:

     *

     * - the caller must be `account`.

     *

     * May emit a {RoleRevoked} event.

     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**

     * @dev Grants `role` to `account`.

     *

     * If `account` had not been already granted `role`, emits a {RoleGranted}

     * event. Note that unlike {grantRole}, this function doesn't perform any

     * checks on the calling account.

     *

     * May emit a {RoleGranted} event.

     *

     * [WARNING]

     * ====

     * This function should only be called from the constructor when setting

     * up the initial roles for the system.

     *

     * Using this function in any other way is effectively circumventing the admin

     * system imposed by {AccessControl}.

     * ====

     *

     * NOTE: This function is deprecated in favor of {_grantRole}.

     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**

     * @dev Sets `adminRole` as ``role``'s admin role.

     *

     * Emits a {RoleAdminChanged} event.

     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**

     * @dev Grants `role` to `account`.

     *

     * Internal function without access restriction.

     *

     * May emit a {RoleGranted} event.

     */
    function _grantRole(bytes32 role, address account) internal virtual {
        require(hasRole(DEFAULT_ADMIN_ROLE, _msgSender()), "AccessControl: must have ADMIN_ROLE");
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**

     * @dev Grants `role` to `account`.

     *

     * Internal function without access restriction.

     *

     * May emit a {RoleGranted} event.

     */
    function _grantAdminRole(address account) internal virtual {
        if (!hasRole(DEFAULT_ADMIN_ROLE, account)) {
            _roles[DEFAULT_ADMIN_ROLE].members[account] = true;
            emit RoleGranted(DEFAULT_ADMIN_ROLE, account, _msgSender());
        }
    }

    /**

     * @dev Revokes `role` from `account`.

     *

     * Internal function without access restriction.

     *

     * May emit a {RoleRevoked} event.

     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// OpenZeppelin Contracts v4.4.1 (access/IAccessControlEnumerable.sol)

pragma solidity ^0.8.0;

/**

 * @dev External interface of AccessControlEnumerable declared to support ERC165 detection.

 */
interface IAccessControlEnumerable is IAccessControl {
    /**

     * @dev Returns one of the accounts that have `role`. `index` must be a

     * value between 0 and {getRoleMemberCount}, non-inclusive.

     *

     * Role bearers are not sorted in any particular way, and their ordering may

     * change at any point.

     *

     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure

     * you perform all queries on the same block. See the following

     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]

     * for more information.

     */
    function getRoleMember(bytes32 role, uint256 index) external view returns (address);

    /**

     * @dev Returns the number of accounts that have `role`. Can be used

     * together with {getRoleMember} to enumerate all bearers of a role.

     */
    function getRoleMemberCount(bytes32 role) external view returns (uint256);
}

// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

/**

 * @dev Contract module which allows children to implement an emergency stop

 * mechanism that can be triggered by an authorized account.

 *

 * This module is used through inheritance. It will make available the

 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to

 * the functions of your contract. Note that they will not be pausable by

 * simply including this module, only once the modifiers are put in place.

 */
abstract contract Pausable is Context {
    /**

     * @dev Emitted when the pause is triggered by `account`.

     */
    event Paused(address account);

    /**

     * @dev Emitted when the pause is lifted by `account`.

     */
    event Unpaused(address account);

    bool private _paused;

    /**

     * @dev Initializes the contract in unpaused state.

     */
    constructor() {
        _paused = false;
    }

    /**

     * @dev Modifier to make a function callable only when the contract is not paused.

     *

     * Requirements:

     *

     * - The contract must not be paused.

     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**

     * @dev Modifier to make a function callable only when the contract is paused.

     *

     * Requirements:

     *

     * - The contract must be paused.

     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**

     * @dev Returns true if the contract is paused, and false otherwise.

     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**

     * @dev Throws if the contract is paused.

     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**

     * @dev Throws if the contract is not paused.

     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**

     * @dev Triggers stopped state.

     *

     * Requirements:

     *

     * - The contract must not be paused.

     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**

     * @dev Returns to normal state.

     *

     * Requirements:

     *

     * - The contract must be paused.

     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**

 * @dev Interface of the ERC20 standard as defined in the EIP.

 */
interface IERC20 {
    /**

     * @dev Emitted when `value` tokens are moved from one account (`from`) to

     * another (`to`).

     *

     * Note that `value` may be zero.

     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**

     * @dev Emitted when the allowance of a `spender` for an `owner` is set by

     * a call to {approve}. `value` is the new allowance.

     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**

     * @dev Returns the amount of tokens in existence.

     */
    function totalSupply() external view returns (uint256);

    /**

     * @dev Returns minted amount of tokens.

     */
    function mintedSupply() external view returns (uint256);

    /**

     * @dev Returns the limit amount for a single coin transaction of tokens

     */
    function mintLimitAmount() external view returns (uint256);

    /**

     * @dev Returns the amount of tokens owned by `account`.

     */
    function balanceOf(address account) external view returns (uint256);

    /**

     * @dev Moves `amount` tokens from the caller's account to `to`.

     *

     * Returns a boolean value indicating whether the operation succeeded.

     *

     * Emits a {Transfer} event.

     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**

     * @dev Returns the remaining number of tokens that `spender` will be

     * allowed to spend on behalf of `owner` through {transferFrom}. This is

     * zero by default.

     *

     * This value changes when {approve} or {transferFrom} are called.

     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**

     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.

     *

     * Returns a boolean value indicating whether the operation succeeded.

     *

     * IMPORTANT: Beware that changing an allowance with this method brings the risk

     * that someone may use both the old and the new allowance by unfortunate

     * transaction ordering. One possible solution to mitigate this race

     * condition is to first reduce the spender's allowance to 0 and set the

     * desired value afterwards:

     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729

     *

     * Emits an {Approval} event.

     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**

     * @dev Moves `amount` tokens from `from` to `to` using the

     * allowance mechanism. `amount` is then deducted from the caller's

     * allowance.

     *

     * Returns a boolean value indicating whether the operation succeeded.

     *

     * Emits a {Transfer} event.

     */
    function transferFrom(

        address from,

        address to,

        uint256 amount

    ) external returns (bool);
}

// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

/**

 * @dev Interface for the optional metadata functions from the ERC20 standard.

 *

 * _Available since v4.1._

 */
interface IERC20Metadata is IERC20 {
    /**

     * @dev Returns the name of the token.

     */
    function name() external view returns (string memory);

    /**

     * @dev Returns the symbol of the token.

     */
    function symbol() external view returns (string memory);

    /**

     * @dev Returns the decimals places of the token.

     */
    function decimals() external view returns (uint8);
}

// OpenZeppelin Contracts (last updated v4.5.0) (access/AccessControlEnumerable.sol)

pragma solidity ^0.8.0;

/**

 * @dev Extension of {AccessControl} that allows enumerating the members of each role.

 */
abstract contract AccessControlEnumerable is IAccessControlEnumerable, AccessControl {
    using EnumerableSet for EnumerableSet.AddressSet;

    mapping(bytes32 => EnumerableSet.AddressSet) private _roleMembers;

    /**

     * @dev See {IERC165-supportsInterface}.

     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControlEnumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**

     * @dev Returns one of the accounts that have `role`. `index` must be a

     * value between 0 and {getRoleMemberCount}, non-inclusive.

     *

     * Role bearers are not sorted in any particular way, and their ordering may

     * change at any point.

     *

     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure

     * you perform all queries on the same block. See the following

     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]

     * for more information.

     */
    function getRoleMember(bytes32 role, uint256 index) public view virtual override returns (address) {
        return _roleMembers[role].at(index);
    }

    /**

     * @dev Returns the number of accounts that have `role`. Can be used

     * together with {getRoleMember} to enumerate all bearers of a role.

     */
    function getRoleMemberCount(bytes32 role) public view virtual override returns (uint256) {
        return _roleMembers[role].length();
    }

    /**

     * @dev Overload {_grantRole} to track enumerable memberships

     */
    function _grantRole(bytes32 role, address account) internal virtual override {
        super._grantRole(role, account);
        _roleMembers[role].add(account);
    }

    /**

     * @dev Overload {_revokeRole} to track enumerable memberships

     */
    function _revokeRole(bytes32 role, address account) internal virtual override {
        super._revokeRole(role, account);
        _roleMembers[role].remove(account);
    }
}

// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

/**

 * @dev Implementation of the {IERC20} interface.

 *

 * This implementation is agnostic to the way tokens are created. This means

 * that a supply mechanism has to be added in a derived contract using {_mint}.

 * For a generic mechanism see {ERC20PresetMinterPauser}.

 *

 * TIP: For a detailed writeup see our guide

 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How

 * to implement supply mechanisms].

 *

 * We have followed general OpenZeppelin Contracts guidelines: functions revert

 * instead returning `false` on failure. This behavior is nonetheless

 * conventional and does not conflict with the expectations of ERC20

 * applications.

 *

 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.

 * This allows applications to reconstruct the allowance for all accounts just

 * by listening to said events. Other implementations of the EIP may not emit

 * these events, as it isn't required by the specification.

 *

 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}

 * functions have been added to mitigate the well-known issues around setting

 * allowances. See {IERC20-approve}.

 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;
    uint256 private _mintedSupply;
    uint256 private _mintLimitAmount;

    string private _name;
    string private _symbol;

    /**

     * @dev Sets the values for {name} and {symbol}.

     *

     * The default value of {decimals} is 18. To select a different value for

     * {decimals} you should overload it.

     *

     * All two of these values are immutable: they can only be set once during

     * construction.

     */
    constructor(string memory name_, string memory symbol_, uint256 totalSupply_) {
        _name = name_;
        _symbol = symbol_;
        _totalSupply = totalSupply_;
    }

    /**

     * @dev Returns the name of the token.

     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**

     * @dev Returns the symbol of the token, usually a shorter version of the

     * name.

     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**

     * @dev Returns the number of decimals used to get its user representation.

     * For example, if `decimals` equals `2`, a balance of `505` tokens should

     * be displayed to a user as `5.05` (`505 / 10 ** 2`).

     *

     * Tokens usually opt for a value of 18, imitating the relationship between

     * Ether and Wei. This is the value {ERC20} uses, unless this function is

     * overridden;

     *

     * NOTE: This information is only used for _display_ purposes: it in

     * no way affects any of the arithmetic of the contract, including

     * {IERC20-balanceOf} and {IERC20-transfer}.

     */
    function decimals() public view virtual override returns (uint8) {
        return 8;
    }

    /**

     * @dev See {IERC20-totalSupply}.

     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**

     * @dev See {IERC20-mintedSupply}.

     */
    function mintedSupply() public view virtual override returns (uint256) {
        return _mintedSupply;
    }   

    /**

     * @dev See {IERC20-mintedSupply}.

     */
    function mintLimitAmount() public view virtual override returns (uint256) {
        return _mintLimitAmount;
    }

    /**

     * @dev See {IERC20-balanceOf}.

     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**

     * @dev See {IERC20-transfer}.

     *

     * Requirements:

     *

     * - `to` cannot be the zero address.

     * - the caller must have a balance of at least `amount`.

     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**

     * @dev See {IERC20-allowance}.

     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**

     * @dev See {IERC20-approve}.

     *

     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on

     * `transferFrom`. This is semantically equivalent to an infinite approval.

     *

     * Requirements:

     *

     * - `spender` cannot be the zero address.

     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**

     * @dev See {IERC20-transferFrom}.

     *

     * Emits an {Approval} event indicating the updated allowance. This is not

     * required by the EIP. See the note at the beginning of {ERC20}.

     *

     * NOTE: Does not update the allowance if the current allowance

     * is the maximum `uint256`.

     *

     * Requirements:

     *

     * - `from` and `to` cannot be the zero address.

     * - `from` must have a balance of at least `amount`.

     * - the caller must have allowance for ``from``'s tokens of at least

     * `amount`.

     */
    function transferFrom(

        address from,

        address to,

        uint256 amount

    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**

     * @dev Atomically increases the allowance granted to `spender` by the caller.

     *

     * This is an alternative to {approve} that can be used as a mitigation for

     * problems described in {IERC20-approve}.

     *

     * Emits an {Approval} event indicating the updated allowance.

     *

     * Requirements:

     *

     * - `spender` cannot be the zero address.

     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**

     * @dev Atomically decreases the allowance granted to `spender` by the caller.

     *

     * This is an alternative to {approve} that can be used as a mitigation for

     * problems described in {IERC20-approve}.

     *

     * Emits an {Approval} event indicating the updated allowance.

     *

     * Requirements:

     *

     * - `spender` cannot be the zero address.

     * - `spender` must have allowance for the caller of at least

     * `subtractedValue`.

     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**

     * @dev Moves `amount` of tokens from `from` to `to`.

     *

     * This internal function is equivalent to {transfer}, and can be used to

     * e.g. implement automatic token fees, slashing mechanisms, etc.

     *

     * Emits a {Transfer} event.

     *

     * Requirements:

     *

     * - `from` cannot be the zero address.

     * - `to` cannot be the zero address.

     * - `from` must have a balance of at least `amount`.

     */
    function _transfer(

        address from,

        address to,

        uint256 amount

    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing

     * the total supply.

     *

     * Emits a {Transfer} event with `from` set to the zero address.

     *

     * Requirements:

     *

     * - `account` cannot be the zero address.

     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        
        require(amount <= _mintLimitAmount, "ERC20: error mint limit");

        _beforeTokenTransfer(address(0), account, amount);

        require(_mintedSupply + amount <= _totalSupply, "ERC20: Exceeding the TotalSupply.");

        _mintedSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most TotalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**

     * @dev SetMintLimitAmount

     */
    function _setMintLimitAmount(uint256 limitAmount) internal virtual returns (bool) {
        _mintLimitAmount = limitAmount;
        return true;
    }

    /**

     * @dev Destroys `amount` tokens from `account`, reducing the

     * total supply.

     *

     * Emits a {Transfer} event with `to` set to the zero address.

     *

     * Requirements:

     *

     * - `account` cannot be the zero address.

     * - `account` must have at least `amount` tokens.

     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= mintedSupply.
            _mintedSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**

     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.

     *

     * This internal function is equivalent to `approve`, and can be used to

     * e.g. set automatic allowances for certain subsystems, etc.

     *

     * Emits an {Approval} event.

     *

     * Requirements:

     *

     * - `owner` cannot be the zero address.

     * - `spender` cannot be the zero address.

     */
    function _approve(

        address owner,

        address spender,

        uint256 amount

    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**

     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.

     *

     * Does not update the allowance amount in case of infinite allowance.

     * Revert if not enough allowance is available.

     *

     * Might emit an {Approval} event.

     */
    function _spendAllowance(

        address owner,

        address spender,

        uint256 amount

    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**

     * @dev Hook that is called before any transfer of tokens. This includes

     * minting and burning.

     *

     * Calling conditions:

     *

     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens

     * will be transferred to `to`.

     * - when `from` is zero, `amount` tokens will be minted for `to`.

     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.

     * - `from` and `to` are never both zero.

     *

     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].

     */
    function _beforeTokenTransfer(

        address from,

        address to,

        uint256 amount

    ) internal virtual {}

    /**

     * @dev Hook that is called after any transfer of tokens. This includes

     * minting and burning.

     *

     * Calling conditions:

     *

     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens

     * has been transferred to `to`.

     * - when `from` is zero, `amount` tokens have been minted for `to`.

     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.

     * - `from` and `to` are never both zero.

     *

     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].

     */
    function _afterTokenTransfer(

        address from,

        address to,

        uint256 amount

    ) internal virtual {}
}

// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;

/**

 * @dev Extension of {ERC20} that allows token holders to destroy both their own

 * tokens and those that they have an allowance for, in a way that can be

 * recognized off-chain (via event analysis).

 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**

     * @dev Destroys `amount` tokens from the caller.

     *

     * See {ERC20-_burn}.

     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**

     * @dev Destroys `amount` tokens from `account`, deducting from the caller's

     * allowance.

     *

     * See {ERC20-_burn} and {ERC20-allowance}.

     *

     * Requirements:

     *

     * - the caller must have allowance for ``accounts``'s tokens of at least

     * `amount`.

     */
    function burnFrom(address account, uint256 amount) public virtual {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}

// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/ERC20Pausable.sol)

pragma solidity ^0.8.0;

/**

 * @dev ERC20 token with pausable token transfers, minting and burning.

 *

 * Useful for scenarios such as preventing trades until the end of an evaluation

 * period, or having an emergency switch for freezing all token transfers in the

 * event of a large bug.

 */
abstract contract ERC20Pausable is ERC20, Pausable {
    /**

     * @dev See {ERC20-_beforeTokenTransfer}.

     *

     * Requirements:

     *

     * - the contract must not be paused.

     */
    function _beforeTokenTransfer(

        address from,

        address to,

        uint256 amount

    ) internal virtual override {
        super._beforeTokenTransfer(from, to, amount);

        require(!paused(), "ERC20Pausable: token transfer while paused");
    }
}

// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/presets/ERC20PresetMinterPauser.sol)

pragma solidity ^0.8.0;

/**

 * @dev {ERC20} token, including:

 *

 *  - ability for holders to burn (destroy) their tokens

 *  - a minter role that allows for token minting (creation)

 *  - a pauser role that allows to stop all token transfers

 *

 * This contract uses {AccessControl} to lock permissioned functions using the

 * different roles - head to its documentation for details.

 *

 * The account that deploys the contract will be granted the minter and pauser

 * roles, as well as the default admin role, which will let it grant both minter

 * and pauser roles to other accounts.

 *

 * _Deprecated in favor of https://wizard.openzeppelin.com/[Contracts Wizard]._

 */
contract ERC20PresetMinterPauser is Context, AccessControlEnumerable, ERC20Burnable, ERC20Pausable {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

    /**

     * @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the

     * account that deploys the contract.

     *

     * See {ERC20-constructor}.

     */
    constructor(string memory name, string memory symbol, uint256 totalSupply) ERC20(name, symbol, totalSupply) {
        _grantAdminRole(_msgSender());

        _setupRole(MINTER_ROLE, _msgSender());
        _setupRole(PAUSER_ROLE, _msgSender());
    }

    /**

     * @dev Creates `amount` new tokens for `to`.

     *

     * See {ERC20-_mint}.

     *

     * Requirements:

     *

     * - the caller must have the `MINTER_ROLE`.

     */
    function setMintLimitAmount(uint256 amount) public virtual {
        require(hasRole(DEFAULT_ADMIN_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have ADMIN_ROLE");
        _setMintLimitAmount(amount);
    }

    /**

     * @dev Set limitForMint

     *

     * See {ERC20- _setMintLimit}.

     *

     * Requirements:

     *

     * - the caller must have the `MINTER_ROLE`.

     */
    function mint(address to, uint256 amount) public virtual {
        require(hasRole(MINTER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have minter role to mint");
        _mint(to, amount);
    }

    /**

     * @dev Pauses all token transfers.

     *

     * See {ERC20Pausable} and {Pausable-_pause}.

     *

     * Requirements:

     *

     * - the caller must have the `PAUSER_ROLE`.

     */
    function pause() public virtual {
        require(hasRole(PAUSER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have pauser role to pause");
        _pause();
    }

    /**

     * @dev Unpauses all token transfers.

     *

     * See {ERC20Pausable} and {Pausable-_unpause}.

     *

     * Requirements:

     *

     * - the caller must have the `PAUSER_ROLE`.

     */
    function unpause() public virtual {
        require(hasRole(PAUSER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have pauser role to unpause");
        _unpause();
    }

    function _beforeTokenTransfer(

        address from,

        address to,

        uint256 amount

    ) internal virtual override(ERC20, ERC20Pausable) {
        super._beforeTokenTransfer(from, to, amount);
    }
}