// File: TokenVestingNoStaking.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "Shared.sol";
import "ITokenVestingNoStaking.sol";
import "SafeERC20.sol";

/**
 * @title TokenVesting
 * @dev A token holder contract that that vests its balance of any ERC20 token to the beneficiary.
 *      Linear lockup - not stakable. 20% cliff unlocking and 80% linear after that.
 *      If revoked send all funds to revoker and allow beneficiary to release remaining vested funds.
 *
 *      The vesting schedule is time-based (i.e. using block timestamps as opposed to e.g. block numbers), and
 *      is therefore sensitive to timestamp manipulation (which is something miners can do, to a certain degree).
 *      Therefore, it is recommended to avoid using short time durations (less than a minute).
 *
 */
contract TokenVestingNoStaking is ITokenVestingNoStaking, Shared {
    using SafeERC20 for IERC20;

    uint256 public constant CLIFF_DENOMINATOR = 5; // x / 5 = 20% of x

    // beneficiary of tokens after they are released. It can be transferrable.
    address private beneficiary;
    bool public immutable transferableBeneficiary;
    // the revoker who can cancel the vesting and withdraw any unvested tokens
    address private revoker;

    // Durations and timestamps are expressed in UNIX time, the same units as block.timestamp.
    uint256 public immutable cliff;
    uint256 public immutable end;

    mapping(IERC20 => uint256) public released;
    bool public revoked;

    /**
     * @param beneficiary_ address of the beneficiary to whom vested tokens are transferred
     * @param revoker_   the person with the power to revoke the vesting. Address(0) means it is not revocable.
     * @param cliff_ the unix time of the cliff, nothing withdrawable before this
     * @param end_ the unix time of the end of the vesting period, everything withdrawable after
     * @param transferableBeneficiary_ whether the beneficiary address can be transferred
     */
    constructor(
        address beneficiary_,
        address revoker_,
        uint256 cliff_,
        uint256 end_,
        bool transferableBeneficiary_
    ) nzAddr(beneficiary_) {
        require(cliff_ <= end_, "Vesting: cliff_ after end_");
        require(block.timestamp < cliff_, "Vesting: cliff before current time");

        beneficiary = beneficiary_;
        revoker = revoker_;
        cliff = cliff_;
        end = end_;
        transferableBeneficiary = transferableBeneficiary_;
    }

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  State-changing functions                //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @notice Transfers vested tokens to beneficiary.
     * @param token ERC20 token which is being vested.
     */
    function release(IERC20 token) external override onlyBeneficiary {
        uint256 unreleased = _releasableAmount(token);
        require(unreleased > 0, "Vesting: no tokens are due");

        released[token] += unreleased;
        emit TokensReleased(token, unreleased);

        token.safeTransfer(beneficiary, unreleased);
    }

    /**
     * @notice Allows the revoker to revoke the vesting. Tokens already vested remain
     *         in the contract for the beneficiary to release, the rest are returned
     *         to the revoker.
     * @param token ERC20 token which is being vested.
     */
    function revoke(IERC20 token) external override onlyRevoker {
        require(!revoked, "Vesting: token revoked");
        require(block.timestamp <= end, "Vesting: vesting expired");

        uint256 balance = token.balanceOf(address(this));

        uint256 unreleased = _releasableAmount(token);
        uint256 refund = balance - unreleased;

        revoked = true;

        token.safeTransfer(revoker, refund);

        emit TokenVestingRevoked(token, refund);
    }

    /**
     * @dev Calculates the amount that has already vested but hasn't been released yet.
     * @param token ERC20 token which is being vested.
     */
    function _releasableAmount(IERC20 token) private view returns (uint256) {
        return _vestedAmount(token) - released[token];
    }

    /**
     * @dev Calculates the amount that has already vested.
     * @param token ERC20 token which is being vested.
     */
    function _vestedAmount(IERC20 token) private view returns (uint256) {
        if (block.timestamp < cliff) {
            return 0;
        }
        uint256 currentBalance = token.balanceOf(address(this));
        uint256 totalBalance = currentBalance + released[token];

        if (block.timestamp >= end || revoked) {
            return totalBalance;
        } else {
            uint256 cliffAmount = totalBalance / CLIFF_DENOMINATOR;
            return cliffAmount + ((totalBalance - cliffAmount) * (block.timestamp - cliff)) / (end - cliff);
        }
    }

    /// @dev    Allow the beneficiary to be transferred to a new address if needed
    function transferBeneficiary(address beneficiary_) external override onlyBeneficiary nzAddr(beneficiary_) {
        require(transferableBeneficiary, "Vesting: beneficiary not transferrable");
        emit BeneficiaryTransferred(beneficiary, beneficiary_);
        beneficiary = beneficiary_;
    }

    /// @dev    Allow the revoker to be transferred to a new address if needed
    function transferRevoker(address revoker_) external override onlyRevoker nzAddr(revoker_) {
        emit RevokerTransferred(revoker, revoker_);
        revoker = revoker_;
    }

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                Non-state-changing functions              //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @return the beneficiary address
     */
    function getBeneficiary() external view override returns (address) {
        return beneficiary;
    }

    /**
     * @return the revoker address
     */
    function getRevoker() external view override returns (address) {
        return revoker;
    }

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                      Modifiers                           //
    //                                                          //
    //////////////////////////////////////////////////////////////
    /**
     * @dev Ensure that the caller is the beneficiary address
     */
    modifier onlyBeneficiary() {
        require(msg.sender == beneficiary, "Vesting: not the beneficiary");
        _;
    }

    /**
     * @dev Ensure that the caller is the revoker address
     */
    modifier onlyRevoker() {
        require(msg.sender == revoker, "Vesting: not the revoker");
        _;
    }
}

// File: Shared.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IShared.sol";

/**
 * @title    Shared contract
 * @notice   Holds constants and modifiers that are used in multiple contracts
 * @dev      It would be nice if this could be a library, but modifiers can't be exported :(
 */

abstract contract Shared is IShared {
    /// @dev The address used to indicate whether transfer should send native or a token
    address internal constant _NATIVE_ADDR = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address internal constant _ZERO_ADDR = address(0);
    bytes32 internal constant _NULL = "";
    uint256 internal constant _E_18 = 1e18;

    /// @dev    Checks that a uint isn't zero/empty
    modifier nzUint(uint256 u) {
        require(u != 0, "Shared: uint input is empty");
        _;
    }

    /// @dev    Checks that an address isn't zero/empty
    modifier nzAddr(address a) {
        require(a != _ZERO_ADDR, "Shared: address input is empty");
        _;
    }

    /// @dev    Checks that a bytes32 isn't zero/empty
    modifier nzBytes32(bytes32 b) {
        require(b != _NULL, "Shared: bytes32 input is empty");
        _;
    }

    /// @dev    Checks that the pubKeyX is populated
    modifier nzKey(Key memory key) {
        require(key.pubKeyX != 0, "Shared: pubKeyX is empty");
        _;
    }
}

// File: IShared.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;
import "IERC20.sol";

/**
 * @title    Shared interface
 * @notice   Holds structs needed by other interfaces
 */
interface IShared {
    /**
     * @dev  SchnorrSECP256K1 requires that each key has a public key part (x coordinate),
     *       a parity for the y coordinate (0 if the y ordinate of the public key is even, 1
     *       if it's odd)
     */
    struct Key {
        uint256 pubKeyX;
        uint8 pubKeyYParity;
    }

    /**
     * @dev  Contains a signature and the nonce used to create it. Also the recovered address
     *       to check that the signature is valid
     */
    struct SigData {
        uint256 sig;
        uint256 nonce;
        address kTimesGAddress;
    }

    /**
     * @param token The address of the token to be transferred
     * @param recipient The address of the recipient of the transfer
     * @param amount    The amount to transfer, in wei (uint)
     */
    struct TransferParams {
        address token;
        address payable recipient;
        uint256 amount;
    }

    /**
     * @param swapID    The unique identifier for this swap (bytes32), used for create2
     * @param token     The token to be transferred
     */
    struct DeployFetchParams {
        bytes32 swapID;
        address token;
    }

    /**
     * @param fetchContract   The address of the deployed Deposit contract
     * @param token     The token to be transferred
     */
    struct FetchParams {
        address payable fetchContract;
        address token;
    }
}

// File: IERC20.sol



// SPDX-License-Identifier: MIT
// 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 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);
}

// File: ITokenVestingNoStaking.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "SafeERC20.sol";

interface ITokenVestingNoStaking {
    event TokensReleased(IERC20 indexed token, uint256 amount);
    event TokenVestingRevoked(IERC20 indexed token, uint256 refund);

    event BeneficiaryTransferred(address oldBeneficiary, address newBeneficiary);
    event RevokerTransferred(address oldRevoker, address newRevoker);

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  State-changing functions                //
    //                                                          //
    //////////////////////////////////////////////////////////////

    function release(IERC20 token) external;

    function revoke(IERC20 token) external;

    function transferBeneficiary(address beneficiary_) external;

    function transferRevoker(address revoker_) external;

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                Non-state-changing functions              //
    //                                                          //
    //////////////////////////////////////////////////////////////

    function getBeneficiary() external view returns (address);

    function getRevoker() external view returns (address);
}

// File: SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "IERC20.sol";
import "draft-IERC20Permit.sol";
import "Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: draft-IERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// File: Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}