// Contract: Asatpad
// Target function: function toString(ShortString sstr) internal pure returns (string memory)
 0 ? n : -n);

        }

    }

}



library Strings {

    bytes16 private constant _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) {

        unchecked {

            uint256 length = Math.log10(value) + 1;

            string memory buffer = new string(length);

            uint256 ptr;

            /// @solidity memory-safe-assembly

            assembly {

                ptr := add(buffer, add(32, length))

            }

            while (true) {

                ptr--;

                /// @solidity memory-safe-assembly

                assembly {

                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))

                }

                value /= 10;

                if (value == 0) break;

            }

            return buffer;

        }

    }



    /**

     * @dev Converts a `int256` to its ASCII `string` decimal representation.

     */

    function toString(int256 value) internal pure returns (string memory) {

        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));

    }



    /**

     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.

     */

    function toHexString(uint256 value) internal pure returns (string memory) {

        unchecked {

            return toHexString(value, Math.log256(value) + 1);

        }

    }



    /**

     * @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] = _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);

    }



    /**

     * @dev Returns true if the two strings are equal.

     */

    function equal(string memory a, string memory b) internal pure returns (bool) {

        return keccak256(bytes(a)) == keccak256(bytes(b));

    }

}



library ECDSA {

    enum RecoverError {

        NoError,

        InvalidSignature,

        InvalidSignatureLength,

        InvalidSignatureS,

        InvalidSignatureV // Deprecated in v4.8

    }



    function _throwError(RecoverError error) private pure {

        if (error == RecoverError.NoError) {

            return; // no error: do nothing

        } else if (error == RecoverError.InvalidSignature) {

            revert("ECDSA: invalid signature");

        } else if (error == RecoverError.InvalidSignatureLength) {

            revert("ECDSA: invalid signature length");

        } else if (error == RecoverError.InvalidSignatureS) {

            revert("ECDSA: invalid signature 's' value");

        }

    }



    /**

     * @dev Returns the address that signed a hashed message (`hash`) with

     * `signature` or error string. This address can then be used for verification purposes.

     *

     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:

     * this function rejects them by requiring the `s` value to be in the lower

     * half order, and the `v` value to be either 27 or 28.

     *

     * IMPORTANT: `hash` _must_ be the result of a hash operation for the

     * verification to be secure: it is possible to craft signatures that

     * recover to arbitrary addresses for non-hashed data. A safe way to ensure

     * this is by receiving a hash of the original message (which may otherwise

     * be too long), and then calling {toEthSignedMessageHash} on it.

     *

     * Documentation for signature generation:

     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]

     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]

     *

     * _Available since v4.3._

     */

    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {

        if (signature.length == 65) {

            bytes32 r;

            bytes32 s;

            uint8 v;

            // ecrecover takes the signature parameters, and the only way to get them

            // currently is to use assembly.

            /// @solidity memory-safe-assembly

            assembly {

                r := mload(add(signature, 0x20))

                s := mload(add(signature, 0x40))

                v := byte(0, mload(add(signature, 0x60)))

            }

            return tryRecover(hash, v, r, s);

        } else {

            return (address(0), RecoverError.InvalidSignatureLength);

        }

    }



    /**

     * @dev Returns the address that signed a hashed message (`hash`) with

     * `signature`. This address can then be used for verification purposes.

     *

     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:

     * this function rejects them by requiring the `s` value to be in the lower

     * half order, and the `v` value to be either 27 or 28.

     *

     * IMPORTANT: `hash` _must_ be the result of a hash operation for the

     * verification to be secure: it is possible to craft signatures that

     * recover to arbitrary addresses for non-hashed data. A safe way to ensure

     * this is by receiving a hash of the original message (which may otherwise

     * be too long), and then calling {toEthSignedMessageHash} on it.

     */

    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {

        (address recovered, RecoverError error) = tryRecover(hash, signature);

        _throwError(error);

        return recovered;

    }



    /**

     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.

     *

     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]

     *

     * _Available since v4.3._

     */

    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError) {

        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);

        uint8 v = uint8((uint256(vs) >> 255) + 27);

        return tryRecover(hash, v, r, s);

    }



    /**

     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.

     *

     * _Available since v4.2._

     */

    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {

        (address recovered, RecoverError error) = tryRecover(hash, r, vs);

        _throwError(error);

        return recovered;

    }



    /**

     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,

     * `r` and `s` signature fields separately.

     *

     * _Available since v4.3._

     */

    function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address, RecoverError) {

        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature

        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines

        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most

        // signatures from current libraries generate a unique signature with an s-value in the lower half order.

        //

        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value

        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or

        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept

        // these malleable signatures as well.

        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {

            return (address(0), RecoverError.InvalidSignatureS);

        }



        // If the signature is valid (and not malleable), return the signer address

        address signer = ecrecover(hash, v, r, s);

        if (signer == address(0)) {

            return (address(0), RecoverError.InvalidSignature);

        }



        return (signer, RecoverError.NoError);

    }



    /**

     * @dev Overload of {ECDSA-recover} that receives the `v`,

     * `r` and `s` signature fields separately.

     */

    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {

        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);

        _throwError(error);

        return recovered;

    }



    /**

     * @dev Returns an Ethereum Signed Message, created from a `hash`. This

     * produces hash corresponding to the one signed with the

     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]

     * JSON-RPC method as part of EIP-191.

     *

     * See {recover}.

     */

    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 message) {

        // 32 is the length in bytes of hash,

        // enforced by the type signature above

        /// @solidity memory-safe-assembly

        assembly {

            mstore(0x00, "\x19Ethereum Signed Message:\n32")

            mstore(0x1c, hash)

            message := keccak256(0x00, 0x3c)

        }

    }



    /**

     * @dev Returns an Ethereum Signed Message, created from `s`. This

     * produces hash corresponding to the one signed with the

     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]

     * JSON-RPC method as part of EIP-191.

     *

     * See {recover}.

     */

    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {

        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));

    }



    /**

     * @dev Returns an Ethereum Signed Typed Data, created from a

     * `domainSeparator` and a `structHash`. This produces hash corresponding

     * to the one signed with the

     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]

     * JSON-RPC method as part of EIP-712.

     *

     * See {recover}.

     */

    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) {

        /// @solidity memory-safe-assembly

        assembly {

            let ptr := mload(0x40)

            mstore(ptr, "\x19\x01")

            mstore(add(ptr, 0x02), domainSeparator)

            mstore(add(ptr, 0x22), structHash)

            data := keccak256(ptr, 0x42)

        }

    }



    /**

     * @dev Returns an Ethereum Signed Data with intended validator, created from a

     * `validator` and `data` according to the version 0 of EIP-191.

     *

     * See {recover}.

     */

    function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {

        return keccak256(abi.encodePacked("\x19\x00", validator, data));

    }

}



library StorageSlot {

    struct AddressSlot {

        address value;

    }



    struct BooleanSlot {

        bool value;

    }



    struct Bytes32Slot {

        bytes32 value;

    }



    struct Uint256Slot {

        uint256 value;

    }



    struct StringSlot {

        string value;

    }



    struct BytesSlot {

        bytes value;

    }



    /**

     * @dev Returns an `AddressSlot` with member `value` located at `slot`.

     */

    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {

        /// @solidity memory-safe-assembly

        assembly {

            r.slot := slot

        }

    }



    /**

     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.

     */

    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {

        /// @solidity memory-safe-assembly

        assembly {

            r.slot := slot

        }

    }



    /**

     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.

     */

    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {

        /// @solidity memory-safe-assembly

        assembly {

            r.slot := slot

        }

    }



    /**

     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.

     */

    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {

        /// @solidity memory-safe-assembly

        assembly {

            r.slot := slot

        }

    }



    /**

     * @dev Returns an `StringSlot` with member `value` located at `slot`.

     */

    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {

        /// @solidity memory-safe-assembly

        assembly {

            r.slot := slot

        }

    }



    /**

     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.

     */

    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {

        /// @solidity memory-safe-assembly

        assembly {

            r.slot := store.slot

        }

    }



    /**

     * @dev Returns an `BytesSlot` with member `value` located at `slot`.

     */

    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {

        /// @solidity memory-safe-assembly

        assembly {

            r.slot := slot

        }

    }



    /**

     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.

     */

    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {

        /// @solidity memory-safe-assembly

        assembly {

            r.slot := store.slot

        }

    }

}



type ShortString is bytes32;



/**

 * @dev This library provides functions to convert short memory strings

 * into a `ShortString` type that can be used as an immutable variable.

 *

 * Strings of arbitrary length can be optimized using this library if

 * they are short enough (up to 31 bytes) by packing them with their

 * length (1 byte) in a single EVM word (32 bytes). Additionally, a

 * fallback mechanism can be used for every other case.

 *

 * Usage example:

 *

 * ```solidity

 * contract Named {

 *     using ShortStrings for *;

 *

 *     ShortString private immutable _name;

 *     string private _nameFallback;

 *

 *     constructor(string memory contractName) {

 *         _name = contractName.toShortStringWithFallback(_nameFallback);

 *     }

 *

 *     function name() external view returns (string memory) {

 *         return _name.toStringWithFallback(_nameFallback);

 *     }

 * }

 * ```

 */

library ShortStrings {

    // Used as an identifier for strings longer than 31 bytes.

    bytes32 private constant _FALLBACK_SENTINEL = 0x00000000000000000000000000000000000000000000000000000000000000FF;



    error StringTooLong(string str);

    error InvalidShortString();



    /**

     * @dev Encode a string of at most 31 chars into a `ShortString`.

     *

     * This will trigger a `StringTooLong` error is the input string is too long.

     */

    function toShortString(string memory str) internal pure returns (ShortString) {

        bytes memory bstr = bytes(str);

        if (bstr.length > 31) {

            revert StringTooLong(str);

        }

        return ShortString.wrap(bytes32(uint256(bytes32(bstr)) | bstr.length));

    }