// File: contracts/ap420.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @title: lgdoucet696969
/// @author: manifold.xyz

import "./manifold/ERC721Creator.sol";

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            //
//                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            //
//                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            //
//                                                                                                                                                                                                                                                                                                                                                                                    ,--,                                                                                                                                                                                                                                                                                                                                                                                                                                         ,---,      //
//                                                                                                                                                                                                                                                                                                                                                                                 ,---.'|                                                                                                                                                                                                                                                                                                                                                                                                                                      ,`--.' |      //
//        ___     ,---,                                                                     ____                      ___                         ___                                            ___                                 ___                                    ____                                                  ____                                             |   | :    ,----..                                                               ____                                                ___     ,---,                                                                    ,---,             ,--,                                     ,--,                       ___                                    ___                         ___     ,---,                                                 |   :  :      //
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//      |  | :,'|  |  :   ,--.'|                      ,--.'|                           ,-+-,.' _ |                  |  | :,'                    |  | :,'                    ,---.       ,---,  |  | :,'  __  ,-.                   |  | :,'                            ,-+-,.' _ |                      ,---,                ,-+-,.' _ |               ,--.'|                      |   ' :  |   :     :                           ,---,    ,---.'|             ,-+-,.' _ |                ,---.'|    __  ,-.  ,---.   |  | :,'|  |  :              __  ,-.        ,--.'|                      \    /  \|  |  :   ,--.'|  |  | :               ,---.'|             |  | :  ,--.'|             |  | :,'               ,---,           |  | :,'   ,---.            |  | :,'|  |  :                     \    /  \   ,---.     ,---.'|   |  |      //
//      :  : ' ::  :  :   |  |,     .--.--.           |  |,     .--.--.             ,-+-. ;   , ||                  :  : ' :           .--.--.  :  : ' :                   '   ,'\  ,-+-. /  | :  : ' :,' ,'/ /|                   :  : ' : .--.--.                 ,-+-. ;   , ||                  ,-+-. /  |            ,-+-. ;   , ||               |  |,     .--.--.           ;   ; '  .   |  ;. /                       ,-+-. /  |   |   | :          ,-+-. ;   , ||                |   | :  ,' ,'/ /| '   ,'\  :  : ' ::  :  :            ,' ,'/ /|        |  |,     .--.--.           |   :    :  :  :   |  |,   :  : '               |   | :             :  : '  |  |,     .--.--.  :  : ' :           ,-+-. /  |          :  : ' :  '   ,'\           :  : ' ::  :  :                     |   :    | '   ,'\    |   | '   :  ;      //
//    .;__,'  / :  |  |,--`--'_    /  /    '          `--'_    /  /    '           ,--.'|'   |  ||   .--,         .;__,'  /    ,---.  /  /    .;__,'  /             ,---. /   /   |,--.'|'   .;__,'  / '  | |' |,--.--.     ,---..;__,'  / /  /    '               ,--.'|'   |  ||   .--,          ,--.'|'   | ,--.--.   ,--.'|'   |  ||,---.          `--'_    /  /    '          '   | |__.   ; /--`             ,--.--.   ,--.'|'   |   |   | |         ,--.'|'   |  ||   .--,         :   : :  '  | |' |/   /   .;__,'  / :  |  |,--.  ,---. '  | |' |        `--'_    /  /    '          |   | .\ :  |  |,--`--'_   |  ' |               |   | |             |  ' |  `--'_    /  /    .;__,'  /    ,---.  ,--.'|'   |        .;__,'  /  /   /   |        .;__,'  / :  |  |,--.  ,---.          |   | .\ :/   /   |   |   | |   |  '      //
//    |  |   |  |  :  '   ,' ,'|  |  :  /`./          ,' ,'|  |  :  /`./          |   |  ,', |  |, /_ ./|         |  |   |    /     \|  :  /`.|  |   |             /     .   ; ,. |   |  ,"' |  |   |  |  |   ,/       \   /     |  |   | |  :  /`./              |   |  ,', |  |, /_ ./|         |   |  ,"' |/       \ |   |  ,', |  |/     \         ,' ,'|  |  :  /`./          |   | :.';   | ;  __           /       \ |   |  ,"' | ,--.__| |        |   |  ,', |  |, /_ ./|         :     |,-|  |   ,.   ; ,. |  |   |  |  :  '   | /     \|  |   ,'        ,' ,'|  |  :  /`./          .   : |: |  :  '   ,' ,'|  '  | |             ,--.__| |             '  | |  ,' ,'|  |  :  /`.|  |   |    /     \|   |  ,"' |        |  |   |  .   ; ,. :        |  |   |  |  :  '   | /     \         .   : |: .   ; ,. : ,--.__| '   :  |      //
//    :__,'| :  |  |   /' '  | |  |  :  ;_            '  | |  |  :  ;_            |   | /  | |--, ' , ' :         :__,'| :   /    /  |  :  ;_ :__,'| :            /    / '   | |: |   | /  | :__,'| :  '  :  /.--.  .-. | /    / :__,'| : |  :  ;_                |   | /  | |--, ' , ' :         |   | /  | .--.  .-. ||   | /  | |--/    /  |        '  | |  |  :  ;_            '   :    |   : |.' .'         .--.  .-. ||   | /  | |/   ,'   |        |   | /  | |--, ' , ' :         |   : '  '  :  / '   | |: :__,'| :  |  |   /' :/    /  '  :  /          '  | |  |  :  ;_            |   |  \ |  |   /' '  | |  |  | :            /   ,'   |             |  | :  '  | |  |  :  ;_ :__,'| :   /    /  |   | /  | |        :__,'| :  '   | |: :        :__,'| :  |  |   /' :/    /  |        |   |  \ '   | |: :/   ,'   ;   |  ;      //
//      '  : |__'  :  | | |  | :   \  \    `.         |  | :   \  \    `.         |   : |  | , /___/ \: |           '  : |__.    ' / |\  \    `.'  : |__         .    ' /'   | .; |   | |  | | '  : |__|  | '  \__\/: . ..    ' /  '  : |__\  \    `.             |   : |  | , /___/ \: |         |   | |  | |\__\/: . .|   : |  | , .    ' / |        |  | :   \  \    `.         |   |  ./.   | '_.' :          \__\/: . .|   | |  | .   '  /  |        |   : |  | , /___/ \: |         |   |  / |  | '  '   | .; : '  : |__'  :  | | .    ' / |  | '           |  | :   \  \    `.         |   : .  '  :  | | |  | :  '  : |__         .   '  /  |             '  : |__|  | :   \  \    `.'  : |__.    ' / |   | |  | |          '  : |__'   | .; :          '  : |__'  :  | | .    ' / |        |   : .  '   | .; .   '  /  `---'. |      //
//      |  | '.'|  |  ' | '  : |__  `----.   \        '  : |__  `----.   \        |   : |  |/   .  \  ' |           |  | '.''   ;   /| `----.   |  | '.'|        '   ; :_|   :    |   | |  |/  |  | '.';  : |  ," .--.; |'   ; :__ |  | '.'|`----.   \            |   : |  |/   .  \  ' |         |   | |  |/ ," .--.; ||   : |  |/  '   ;   /|        '  : |__  `----.   \        ;   : ;  '   ; : \  |          ," .--.; ||   | |  |/'   ; |:  |        |   : |  |/   .  \  ' |         '   : |: ;  : |  |   :    | |  | '.'|  |  ' | '   ;   /;  : |           '  : |__  `----.   \        :     |`-|  |  ' | '  : |__|  | '.'|        '   ; |:  |             |  | '.''  : |__  `----.   |  | '.''   ;   /|   | |  |/           |  | '.'|   :    |          |  | '.'|  |  ' | '   ;   /|        :     |`-|   :    '   ; |:  |`--..`;      //
//      ;  :    |  :  :_:,|  | '.'|/  /`--'  /        |  | '.'|/  /`--'  /        |   | |`-'     \  ;   :           ;  :    '   |  / |/  /`--'  ;  :    ;        '   | '.'\   \  /|   | |--'   ;  :    |  , ; /  /  ,.  |'   | '.'|;  :    /  /`--'  ___          |   | |`-'     \  ;   :         |   | |--' /  /  ,.  ||   | |`-'   '   |  / |        |  | '.'|/  /`--'  /        |   ,/   '   | '/  .'         /  /  ,.  ||   | |--' |   | '/  '        |   | |`-'     \  ;   :         |   | '/ |  , ;   \   \  /  ;  :    |  :  :_:,'   |  / |  , ;           |  | '.'|/  /`--'  /        :   : :  |  :  :_:,|  | '.';  :    ;        |   | '/  '___          ;  :    |  | '.'|/  /`--'  ;  :    '   |  / |   | |--'            ;  :    ;\   \  /           ;  :    |  :  :_:,'   |  / |        :   : :   \   \  /|   | '/  .--,_         //
//      |  ,   /|  | ,'   ;  :    '--'.     /         ;  :    '--'.     /         |   ;/          \  \  ;           |  ,   /|   :    '--'.     /|  ,   /         |   :    :`----' |   |/       |  ,   / ---' ;  :   .'   |   :    :|  ,   '--'.     /  .\         |   ;/          \  \  ;         |   |/    ;  :   .'   |   ;/       |   :    |        ;  :    '--'.     /         '---'    |   :    /          ;  :   .'   |   |/     |   :    :|        |   ;/          \  \  ;         |   :    |---'     `----'   |  ,   /|  | ,'   |   :    |---'            ;  :    '--'.     /         |   | :  |  | ,'   ;  :    |  ,   /         |   :    :/  .\         |  ,   /;  :    '--'.     /|  ,   /|   :    |   |/                |  ,   /  `----'            |  ,   /|  | ,'   |   :    |        |   | :    `----' |   :    :|    |`.      //
//       ---`-' `--''     |  ,   /  `--'---'          |  ,   /  `--'---'          '---'            :  \  \           ---`-'  \   \  /  `--'---'  ---`-'           \   \  /        '---'         ---`-'       |  ,     .-./\   \  /  ---`-'  `--'---'\  ; |        '---'            :  \  \        '---'     |  ,     .-.'---'         \   \  /         |  ,   /  `--'---'                    \   \ .'           |  ,     .-.'---'       \   \  /          '---'            :  \  \        /    \  /                    ---`-' `--''      \   \  /                 |  ,   /  `--'---'          `---'.|  `--''     |  ,   / ---`-'           \   \  / \  ; |         ---`-' |  ,   /  `--'---'  ---`-'  \   \  /'---'                  ---`-'                      ---`-' `--''      \   \  /         `---'.|            \   \  / `-- -`, ;     //
//                         ---`-'                      ---`-'                                       \  ' ;                    `----'                               `----'                                     `--`---'     `----'                    `--"                           \  ' ;                   `--`---'                  `----'           ---`-'                                `---`              `--`---'                `----'                             \  ' ;        `-'----'                                        `----'                   ---`-'                       `---`             ---`-'                    `----'   `--"                  ---`-'                      `----'                                                                       `----'            `---`             `----'    '---`"      //
//                                                                                                   `--`                                                                                                                                                                            `--`                                                                                                                                                                                    `--`                                                                                                                                                                                                                                                                                                                                                             //
//                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            //
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contract ap420 is ERC721Creator {
    constructor() ERC721Creator("lgdoucet696969", "ap420") {}
}

// File: contracts/manifold/ERC721Creator.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @author: manifold.xyz

import "@openzeppelin/contracts/proxy/Proxy.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/StorageSlot.sol";

contract ERC721Creator is Proxy {
    
    constructor(string memory name, string memory symbol) {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = 0x2d3fC875de7Fe7Da43AD0afa0E7023c9B91D06b1;
        (bool success, ) = 0x2d3fC875de7Fe7Da43AD0afa0E7023c9B91D06b1.delegatecall(abi.encodeWithSignature("initialize(string,string)", name, symbol));
        require(success, "Initialization failed");
    }
        
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
     function implementation() public view returns (address) {
        return _implementation();
    }

    function _implementation() internal override view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }    

}

// File: node_modules/@openzeppelin/contracts/proxy/Proxy.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/Proxy.sol)

pragma solidity ^0.8.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    /**
     * @dev This is a virtual function that should be overridden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overridden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}

// File: node_modules/@openzeppelin/contracts/utils/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);
        }
    }
}

// File: node_modules/@openzeppelin/contracts/utils/StorageSlot.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 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
        }
    }
}