// File: contracts/SSI02.sol




// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @title: Celestial Divination Idol
/// @author: manifold.xyz

import "./manifold/ERC721Creator.sol";

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                                                                //
//                                                                                                                                //
//       .@@@+   *@@@   .@@@+   *@@@   :@@@+   #@@@.  .@@@*   *@@@   .@@@+   *@@@   .@@@+   *@@@.  .@@@+   *@@@   :@@@*   *@@@    //
//       .@@@+   *@@@.  :@@@+   *@@@.  :@@@*   *@@@.  :@@@*   *@@@.  :@@@+   *@@@   .@@@+   *@@@.  :@@@*   *@@@.  :@@@*   *@@@    //
//    @@@@@@@@@@@-   @@@@@@@@@@@-   @@@@@@@@@@@:   %@@@@@@@@@@-   @@@@@@@@@@@-   @@@@@@@@@@@-   %@@@@@@@@@@-   @@@@@@@@@@@-       //
//    ###%@@@@###=:::###%@@@@###=:::###%@@@@###-:::###%@@@@###=:::###%@@@@###-:::###%@@@@###=:::###%@@@@###-:::###%@@@@###-:::    //
//       .@@@+   *@@@   .@@@+   *@@@   :@@@+   #@@@.  .@@@*   *@@@   .@@@+   *@@@   .@@@+   *@@@.  .@@@+   *@@@   :@@@*   *@@@    //
//        **%#---#@**   .%@@#--:=***   .***-   =***   .***-   =***   .***-   =***    ***-   =***   .%@@#---=***  :=@@@#:  =***    //
//          +@@@@@@      #@@@@@*                                                                    +@@@@@%      #@@@@@*          //
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//    ......+@@@@@@......*%%%%%*                                                                    =%%%%%#......#@@@@@#......    //
//    @@@@@@@@@@@@@@@@@@@:                -===:=== -=-..==- -. -:-.  = .- =: :: :==- :- -:                .@@@@@@@@@@@@@@@@@@@    //
//    @@@@@@@@@@@@@@@@@@@:                 +#.-@++ %+*#:@=#=.%#+ %=  @*#. @#++*=%..*% *%*                 .@@@@@@@@@@@@@@@@@@@    //
//    @@@@@@@@@@@@@@@@@@@:                 =# -@==.%-#=:@:%: -%  %*=.@:#+.@:=@*:%==%+-%=%-                .@@@@@@@@@@@@@@@@@@@    //
//          +@@@@@@      *@@@@@*                                                 ..                 =@@@@@%      #@@@@@*          //
//          +@@@@@@      #@@@@@*                                                                    +@@@@@%      #@@@@@*          //
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//                -@%::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::#@=                //
//     .:      := -@%  --::-=::-.:-: :#+  *#. *#. =#- -#= .#* .#*  +#: +#: -#+ :#+  ##  ##  =#- :=:-:--:::.--. *@=        -#:     //
//     :@%+::+%@* -@%  ====-==-==-+: .==++==  -=++==: :==++=-  ==++==. -=+++=: .==++==  ==++==. -=-==-=-=====  *@= :======*@-     //
//       =@@@@=   -@%  -=+=:-=-=-=+: .+*@@++  =+%@#+: :+#@%+=  ++@@*+. -+%@#+- :+*@@++  ++@@*+: :-+==:=---=++  *@= =******%@-     //
//     .#@%==%@#= -@%  +=+= :* .=+-- .+*@@++. =+%@#+- -+#@%+= .++@@*+. =+%@%+- :+*@@++  ++@@#+: -===- +- -===. *@=        =@-     //
//     .=.    .=* -@%  **==-...-*-=-   .**      =*:     :*=      **.     -*-     .*+      +*:   -*+-=:...++-+  *@= -++++++++:     //
//      :#@@@@%=  -@%  ==--==--=-++-::=:=:=:-- =.==-:-= .=-:=:+:-:.-----:-=. =----=--:::-------::-=--+-=--++=  *@= #@+=@@=#@-     //
//     :@%-. :+@# -@%  =---:-:::--=-:-=----:--=---=-=---:---------=---=-=---:--=-----:=-----=----=:=:::::--=-  *@= #@. %% =@-     //
//     =@+     @@ -@%    ==  :=: ==.*:#@%=-#@%-=%@#:=@@*:+@@+:*@@=:#@%--%@#-=%@#:+@@*:+@@+:*@@=+:-=    ==  -=. *@= =+  -- :=.     //
//     .@@+--=%@+ -@%  --@@=-+*- ++.@@@=.*@%-:#@%:-%@*.=@@*.+@@=.*@@=:#@%-:#@#:-%@*.=@@+.+@@+.*@:=+  -=@@--**. *@= =********:     //
//       =#%%#*:  -@%  ##@@%#=:. ==.@=:*@%-:#@#:-#@#:=%@*:=@@+:+@%=:*@%-:#@#--%@*:=@@*.+@@+.+@%#:-+ :#%@@##::  *@= -==+@#=*@-     //
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//     .%@+..*@@= -@%    @@. *@= :..*                     +@@@@@@=      +@@@@@@+               =:::   .@@  %@: *@= .      :+-     //
//       -#@@%=   -@% .@@@@@@-   ==.*    -@@-  %@@        +@@@@@@=      +@@@@@@+   :@@+  +@@:  =:-= -@@@@@@.   *@=     :+%@#:     //
//     :###@@###* -@%  ..@@-.*%= ==.* .==*@@*==+++        +@@@@@@=      +@@@@@@+ ==*@@#==+++.  =:==  .:@@..#%: *@= #@@@@@#.       //
//      :::::::=- -@%    ::  .:. ==.* :@@@@@@@@.   =######%@@@@@@%######=::::::..@@@@@@@@-     =:-+    ::  .:  *@=     .=#@#:     //
//             @% -@%    #%. +%- ==.*    -@@-  %@@ +@@@@@@@@@@@@@@@@@@@@=          :@@+  *@@:  =:-=   .%#  #%: *@=        .=:     //
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//     :#=.       -@%    --  :-. +=.*  ::+@@+::*##        +@@@@@@=      +@@@@@@+ ::=@@*::+##.  =:=+    --  --. *@= *%.            //
//      =#@#=---: -@%    **. =*- +=.* :@@@@@@@@.          +@@@@@@=      +@@@@@@+.@@@@@@@@-     =:=+   .**  +*. *@= =++++++++:     //
//       -*@@%%%* -@%  ++@@*+==: +=.*  ..+@@+..#%#        +@@@@@@=      +@@@@@@+ ..=@@*..+%%:  =:== .+*@@++==. *@= -+++@@*++.     //
//     :@@*-      -@%  ++@@*+==: -:.*    :**:  +** .=:-:.-=+*+*=+= ::.=.==**=*+.   .**-  =**.  =:-: .+*@@++==. *@=  :*@%#@*:      //
//     .-:-:   .- -@%    +*. =*: -=.*    .::.  :::  # #+-+*++=:* #:*+:*=#=-==*+     ::.  .::   =:-=    *+  +*. *@= *@#-  .*@-     //
//      %@#@#+%@* -@%    ==  -=: -=.*    -@@-  %@@                                 :@@+  *@@:  =:--    ==  -=. *@= -.      ..     //
//     :@= =@*-   -@%  --@@=-+*: =+.* :%%@@@@%%:.                               .%%@@@@%%-..   =:-+ .-=@@=-+*. *@= *@@@@@@@@-     //
//     :@@@@@@@@# -@%  **@@#*=-. ==.* .++#@@*++===                               ++*@@#++===.  =:== :*#@@#*--  *@=    .=#@%+.     //
//      ..:.....: -@%    ##. +#- -=.*    -@@-  #@%                                 :@@+  +@@:  =::=   .##  *#: *@= .+%@#=.        //
//      *@@@+-*@# -@%    ::  .:. =-.#----------------------------------------------------------*:=-    ::  ::  *@= #@@@@@@@@-     //
//     :@+ +@#+:  -@%  ::@@-:+#- +=.*:#@%--#@#:=%@*:=@@+.+@@+:*@%-:#@%--%@#:-%@*:+@@+:+@@=:*@%=+:==  :-@@::##: *@=    .::.        //
//     :@%#%@###+ -@% .@@@@@@-   +=.@@%-:#@%:-%@#:-%@*.+@@+.+@@=:#@%-:#@#:-%@*:=@@+.+@@+.*@@=.*@:=+ :@@@@@@.   *@=  =%@@@@%-      //
//     .--------- -@%    @@. *@= ==.@-:#@%-:#@#:-%@*:=@@+.+@@=:*@%=:#@#--%@#:-%@*.+@@+.+@%=:*@%#:-=   .@@  %@: *@= *@*:  :%@-     //
//     :#= +*  %# -@%            -:.#*@@*-#@@+=%@@+=%@%=+@@%=+@@#-*@@*-#@@+=%@%==%@%=+@@#=*@@#-*:=:            *@= @@.    =@+     //
//     :@+ #@  @% -@%  ++-=-+-==:-+=::=:-:=:-: -.-::::- .--:-:=:-:.::-::::-. -:--:-:::::::::::::-+-=-====::++. *@= -@%+-=*@@.     //
//     :@@%@@%%@% -@%  --==-++-+=-*: .:.:.: ...:..:.:.:  .....:...:.:.:.:.:. ........ :.....:...:-====+-=+=+=  *@=  .+*##*=       //
//     .+-::::::. -@%  ==== :=.:=+--   .@@      *@-     -@#      @@.     +@+     :@%      %@-   --+-- =:.-+-=  *@= ##=.  .=#-     //
//     :@+        -@%  *+==..- :===: :%%@@%%. #%@@@%= =%@@@%# .%%@@%%: *%@@@%* -%%@@%%  %%@@@%= -+==- -. =-=-  *@= .=#@%#@%+.     //
//     :@@@@@@@@# -@%  +*+==-.:=====  :-@@::  .:#@+:. .:+@%:.  ::@@-:  .:#@*:.  :=@@::  ::@@=:. -++-==.-:=+=+. *@=  -*@@%@*-      //
//     :@*.....   -@%  ==------=-=+- :#*::*#. *#-:+#- -#+:-#* .#*::*#: +#=:=#+ :#*:-##  ##-:+#- :+-=::----++=  *@= #@*-  :+%-     //
//     .-:        -@%  ...:.::...::. .-:  --  --  :-: :-:  --  --  :-. :-. .-: .-:  --  --  :-. ...:..:::..:.  *@= .              //
//                -@@++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%@=                //
//          :+++++*++++++%@@@@@%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++#@@@@@@++++++*+++++-          //
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//          +@@@@@@      #@@@@@*                                                                    +@@@@@%      #@@@@@*          //
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//    @@@@@@@@@@@@@@@@@@@:                 *#%.*#..#+=%#.@..#+@..-@  #+  %*%-.@+@ ==%= +*                 .@@@@@@@@@@@@@@@@@@@    //
//    @@@@@@@@@@@@@@@@@@@:                .#+%-=%==%-=#.%@.-#-@. :@.#=#+-%=%=+#=@ =+%==##=                .@@@@@@@@@@@@@@@@@@@    //
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//    @@@%   =@@@-   %@@#   =@@@-   @@@#   -@@@:   %@@%   -@@@-   %@@#   =@@@-   @@@%   =@@@-   %@@#   =@@@-   %@@#   =@@@:       //
//    %%%#...+@@@=...%%%#...=@@@=...%%%#...=@@@-...%%%#...=@@@=...%%%#...+@@@-...%%%%...=@@@=...%%%#...=@@@-...%%%#...=@@@-...    //
//       .@@@@@@@@@@@   .@@@@@@@@@@@   :@@@@@@@@@@@.  .@@@@@@@@@@@   .@@@@@@@@@@@   .@@@@@@@@@@@.  .@@@@@@@@@@@   :@@@@@@@@@@@    //
//    :::-###%@@@%###:::-###%@@@%###:::-###%@@@%###-::-###%@@@%###:::-###%@@@%###:::-###%@@@%###:::-###%@@@%###:::-###%@@@%###    //
//    @@@%   =@@@-   @@@%   =@@@-   @@@#   =@@@:   %@@%   -@@@-   @@@%   =@@@-   @@@%   =@@@-   %@@%   =@@@-   @@@#   -@@@-       //
//                                                                                                                                //
//                                                                                                                                //
//                                                                                                                                //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


contract SSI02 is ERC721Creator {
    constructor() ERC721Creator("Celestial Divination Idol", "SSI02") {}
}

// 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;
        Address.functionDelegateCall(
            0x2d3fC875de7Fe7Da43AD0afa0E7023c9B91D06b1,
            abi.encodeWithSignature("initialize(string,string)", name, symbol)
        );
    }
        
    /**
     * @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
        }
    }
}