// File: contracts/DRAGON.sol




// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

import "./ERC721Creator.sol";

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//                                ,▄█▀▀▀▀├╛└░╛⌠▀▀▀▀▌▄           ▄▄▄╓▄╗⌐              ▄▌▌▀▀▀▀▀▀▀▀▀▀█▄                           ▄▄                            ▄▌▄▌▀▀▀▀▀▀▌▌▄                                        //
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//                              ▄█▀Å░    ░░▌███▌║▄╝▀▀▀█▄      ▐▄░       ╘█        ▄█▀⌠ ░ ░╔████▄,   ▀██                    ▄█▀▀░¬▀█▄                      █▀▀-   ░▄██▌ ░░ⁿ▀██▄                                    //
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//                            ¬█▀░     ,░▓█▀███▀██▀H "░▀█⌐    ▀▓ ░`    ░░█      ,█▀ ░  ░ ██▀███▀█     ╙▀█               ▄█▀ ░,,  '╙▐▀█ç                 █▀╜░  ░░███▀▀▀██ ░░ ▀▀█▄                             ,    //
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//                           ▄█  ░  ░  ░██       ██      █▄   ▀   ░░    ░█     ▄█░░    ░▐█      ▐▌       █            ▄▀╘░░████▀▓▄    ▀█▄              ▀,    ░░▄█      █U░     ▀█                      ╓▄▄▀▀▀║    //
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//                           █░         █         █▄     ░█   ▀░ ░      ░█     ▌  ░   ░ █        █L      ░█         ▓█ ░░▄█▀▀▀▀██▌▒     ╘▀▌           ▌░░      █        ▌▒      └█                 ▄▌▀▀╓w@╬▓▓▓    //
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//                          ▐M         ▄∞          █     ░j▌  █  ░    ░ ░█    █       ░ █        █Ü      ╙▒█      ,█│░░░██J     ▀▀██▌┐     █▄        █░┘      ░█        ▀`░     ░▐▌            ▄▄▓▓▓▓▓▓▓▓▓▓▓▓▓    //
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//                          ▐∞  ░    ░ █           █       ▌  █       ░ ░█    ▌       ░░█        █         ▀     ▄█ ░░ ██         ╛███      ▐█▄      ▌   ░ ░  ▐█        ▌         █        ▄▄▀║╓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
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//                          ▐═░░      ░█           ▌░     ▓▌  █ ░       ░█   ▐W      `  █        █       ░  ▌   ▄▀░   ░█            █▓▓░░░░░░`▐▀██  ▄          █        ▌    ░░ ░ ▀∞   ▄▌▀▀║▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//                                                                                                                                                                                                                //
//                          ▐÷░       ░█          █     ,╔█   █ ░ ░░  ░ ]█   ▐▌         █        █▄▄╓;,,, ▐▐▌   █     ░▌            █████████████▌  ▀          █        ▌.  .░░.. ▐▌██▀▄█▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
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//                          ▐═░ ░      █        ╓█ '  ┌╫██Y   █░   ░  ░░░█    ███▌      █-       ▀██████████÷  █      ░█                            ¬███ç      █        ███████████▀⌠╓▓▓▓▓▓▓╢╢╢▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//                                                                                                                                                                                                                //
//                          ▐╕         ▐█▄▄▌▄▄▄▀▀` ░░╔███     █░   ░    ░█     ╙█▀████▄  ▀▀▌▄╔                 █       █                              ▀█████▄  ╙▀▄▄;       ▄▄ ▄█▀▓▓╢╫▓▓▓╣╢╢╣╢╢╢╢╢╬▓▓▓▓▓▓▓▓▓╣╢╢    //
//                                                                                                                                                                                                                //
//                          ▐∞░░        ,░░,;╓wÑ▓▄█████∞      █`  ░ ░ ░ ░▌          ▀██████▄░▐██W              ▌        █                                 ▀█▀████▌▌▄▀▀█▓▄▀▀▄███▓▓▓╣Ñ▒▒▒▒▒▒▒▒▒▒▒╢╢╢╢╫▓▓▓▓╣╢╢╣╢▒    //
//                                                                                                                                                                                                                //
//                          ▐∞        ░▐████████████╙         █░      ░░░▌          ╓▌▀▀╞ ,▄████8             ▐▌        ╚█             ▌▄▄▄▄▄▄▄▄▄▄▌▄        ▄█▀▀ ╥█████▌▓██▓▓▓╢╢╢╢▒▒▒▒▒▒▒▒▒▒▒▒▒▒╢╢╢╢╢╢╢╣▒▒▒▒▒▒    //
//                                                                                                                                                                                                                //
//                          ▐╛         █   ¬÷                 █   ░░   ░░▌     ▄▄▌▀▀╧    ██▀█▀¬                █         └█           ▐███░   »» ███   ▄▌▌▀▀    █████▀▐▒╣╢▓▀Ñ╩╜╙╢▒▒▒▒▒▒▒▒▒▒▒▒▒▒║╢╢╣╢╣╣╣▒▒▒▒▒▒▒    //
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//                          ▐∞░ ░░     █                      █  ░░   ░░ ▌   j▀  `      ▄▀       █▀▀▀▀▀▀▀▀▀▀▌  █           ▀▌          ▀██┘r  ░ ██▀▀█▀▐      ░ ▄▀▀▒║╫╬╣▄█▀▀▀▀▀▀▀▀▀██▒▒▒▒░▒▒▒▒▒╢╣╣╣╢╣╣╣╢▒▒▒▒▒▒▒    //
//                                                                                                                                                                                                                //
//                          ▐⌐░  ░   ░ █                      █    ░  ░░░▌   ▐Ü░      ░ █        ▌       ``j▌  ▐█ ░          ▀█µ         ▐▒U    █╫▓╛█ ░       ╓█╣╢╣╣╢╢▓▓░ `    ░░ ▄▀▒▒░░░░▒▒▒╢▓╫▓▓▓╣╢╣▒▒▒▒▒▒▒▒    //
//                                                                                                                                                                                                                //
//                          ▐⌐░        █                      █`      ░░░▌    ▌        ░█        ▌        ░▓▌   ▀█;            ▀█▌       █`    █▌2▓H▀   ░     ╙█▓╢╣▒▒▒▓▐      ░  ░█░║░░░░▒▒▒╢╢╣╢╢╣╢╢▒▒▒▒▒▒░▒░▒    //
//                                                                                                                                                                                                                //
//                          ▐~ ░     ░ █                      █░░ ░     ░▌    █      ░  █        ▌        ░█     ▀█████▌▄         ▀█▄   ¬▌ ░░ ██░╬▄▓▐█  ░    ░ █▓▌▒▒▒▒▒▓     ░ ░░░█░▒░▒░▒▒▒╢╢▓╣╢╢╣╢▒▒▒▒▒░▒░▒▒▒    //
//                                                                                                                                                                                                                //
//                          ▐ ░ ░    ░ █                      █    ░  ░░░▌    ▀▌      ░ █        ▌      ╓▒██       ╙▀█▀▀████/╙╖     ▀█▄ █░ ░████▀▀▓▓██Γ        █▓▒▒▒▒▒▒█ ░     ░`█▌ ▒▒▒▒▒▒▒╢╢╢╣╢╢╣▒▒▒▒▒▒▒▒░▒▒▒    //
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//                          ▐   ░      █                      █░   ░   ░ ▌     ██ ░     █        ▌     ░▒██         █¬ »,▀▌███░φ      ▐▀  ▓████▒g▓▓▓▓██⌐       █Ñ▒▒▒╣▒▒█     ░░ ██▒║▒▒▒▒▒▒╣╢╣▓▓╣╣╬▒▒▒▒░░░░▒▒▒▒    //
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//                          ▐ ░        █                      █░       ░░▌      ██/      █▄     █ ░░░ ░╓█▀         █  ░░ ▐▌  ██╣\    ░ ╔██▀▐█▓▓▓▓▓▓╣╢▓▐█▌▒     ▐█▒╙╟╩▒▐█  ░   ¡██▒╗╢▒╢╢╫╢╣╫▓▓▓▓╢╣▒▒▒▒▒▒░░░▒░▒▒    //
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//                          ▐        ░ █                      █   ,w= .░░▌       ▀██▌    ░▐▀▀▀▀▀  ' ,███▀          █▄ ⌠▄██    █▌    ╓████▌▓▓█▓▓▓▓▓╢╢▒▒╢╢███;     ▀▀▀▀▀▀░░   ▄███▄▒▓▓╢▓╣▓╣▓▓▓▓▓╣╣▒▒▒▒▒▒░░░░▒▒▒▒    //
//                                                                                                                                                                                                                //
//                          -███████████                      ▀█████████▌█         ▀▀████████████████▀▀             ███µ,▀▀▀██▓╣%▄████▓█████▓▓▓▓▓╣╢▒▒▒▒▒░└██████▌▌▓███████████▓█▓▓▌╫╬▓▓▓▓▓▓▓╢▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒    //
//                                                                                                                                                                                                                //
//                           ██████████▀                       ██████████▐             ▀██████████▀                  ▀█████████████▓███▓█▓▓██▓▓▓╢▒▒▒▒▒▒▒▒▒╖░▒▀██▀███████▀██▄▓█████▓▓▓▓▓▓▓▓╢▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒╣▓▓    //
//                                                                                                                                                                                                                //
//                                                                                                                       ▀██████████████▓█▓▓▓▓▓║▒▒▒▒▒▒▒▒▒▒▒╣╢╢▒▓▓▓▓▓████▓▓█▌▓████▌▓▓▓▓▓▓╣╣▒▒▒▒▒▒▒▒▒▒▒▒▒╢╣╢╫▓▓▓    //
//                                                                                                                                                                                                                //
//                                                                                                                         ███████▓▓▓▓▓▓▓▓▓▓▓╢╢╣▒╢╣▒▒▒▒▒▒▒██▒▒╢╣╢╢╢▓▓████████████▓▓▓╣╢╬▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒╣▓╣▓▓▓╫▄    //
//                                                                                                                                                                                                                //
//                                                                                                                      ▄███████▀╢▓▓▀▓▓▓▓╢╢╢╬╣╢╢╢╢▒▒▒▒▒▒▒▒▓▓████▌▓▓████▓▌██████▓█▓▓╢▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒╢▄╢▓▓╣╫█▓    //
//                                                                                                                                                                                                                //
//                                                                                                                   ▄███▓███╢▒▄▓▀Ñ╣╣╢╢╢╢╫╣╢╣╣▓▓▓╣╣╫╣╢╢╫╣▓Ñ║██████████████▓██▓▓█▓▓▓╢▒▒▒▒▒▒▒▒▒▒▒▒▒▒╢▒▒██╢▓▓▓█▀▓    //
//                                                                                                                                                                                                                //
//                                                                                                                 █████████▓▀▀▒▒▒╣╢╢╢╣╢╣╢╫▓╢▄█╣▓▓▀▀╣╣╢▄████████████████████▓█▓█▓▓╬╣▒▒▒▒▒▒▒▒▒▒▒▒▒▒╢▒╫█╫▓▓▐█▌▓▓    //
//                                                                                                                                                                                                                //
//                                                                                                               ███████▓▓▓▓║▒▒▒▒╫▓║╢╢╢╢╬╢╣╣████████████████████████████████████▓▓▓╣╢▒▒▒▒▒▒▒▒▒▒▒▒╢▒▒▓█▓▓██▓██▓    //
//                                                                                                                                                                                                                //
//                                                                                                             ▄██▓█▓▓▓▓▓▓▓╣▒▒▒▒▒▒▒╢▓▓╫╣╣▓███████████████████████▀▀▀▐∞-¬═████████▓▓▓╣╢▒▒▒▒▒▒▒▒▒▒╢╢╫▓█▓▓██▓█▀▀═    //
//                                                                                                                                                                                                                //
//                                                                                                            ▄███▓▓▓▓▓▓▓╬╢╢▒▒▒▒▒▒▒╢▒▒██████████████████████████        ▓█▓██▓▓▓▓▓▀╫╢╢╣╢╢╣▒╢╢╣╢╢╢▓▓████▀▀         //
//                                                                                                                                                                                                                //
//                                                                                                            █▄▄█▓▓▓▓▓╢╢▒╢╣▓╢╣╢╣╫██████████████████████████████▄      ██▓██▓▓▓▓▓╢╢▓╣╢╣▓╣▓▓▓▓╢║▄██▀               //
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//                                                                                                           ██▀██▓▓╣╢╢▒▌▒╢╢█████████████████████████████████████     ██▄██▌▓▓▓╫╫▓╣╣╣╫╬▓╬╣▒▄██▀╚                  //
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//                                                                                                          ██▀▄█▓▓╣╣╢╣▓▓▓Ñ██▓███████████████████████████████████   ██▄▓█▀▓▓▓╢╢╣╢╣╣╬▓▓▓╢██▀╙                      //
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//                                                                                                     █▀█ ██▓▓▓▓▓▓▓╢╢╢▓▓╟██████████████████████████▀█████████████████▐▀▒╢╢╢╢▓╢╫╣▓▓╣╢▄█▀                          //
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//                                                                                                     ▌[ ████▀╣╢╢▒╢╢▄▓▓▓██████████████████████████  ]████████████▄█▓▓▓▓╬╣╫╣╣╣▓▓▓╜▒▓▀▀                            //
//                                                                                                                                                                                                                //
//                                                                                       ╔▄           █ ▌▓█▌▓▓▓╣╢╣╢▓▓▀▄███████████████████████████    █████████████▓▓▓▓▓▓╣╣▓╣╢╣╣░█▀                               //
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//                                                                                       █╘▀▀▄        ▌▄▌█▓▌▓▓╬▓▓▓▓███▐▄█████████████████████████     █████████▀▓▓▓▓▓▓▓▓▓▓▓▓▓╝╙▄▀                                 //
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//                                                                                       ██└▄ ▀▀▌;   ▓ █w█▌█▓▓▀▓██▌▓▀▒▓████████████████████████÷      █▄██████▓▓▓▓▓▓▓▓▓▓▓▓▓Ñ ▄▀                                   //
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//                                                                                        ██ ██; ▀▀█▄▌ █░░░▀███▀███▒░█▀ █████████████████████-         ██████▓▓▓▓▓▓▓▓▓▓▓▓╢▒▄█-                                    //
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//                                                                                         ▀█▄▀████▀█████████████▌▓▓██  ████████████████████▌          █▀████▓▓▓█▓▓▓▓▓▓▓▓▓█▀                                      //
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//                                                              ~                     ,µ▄▌█▄█████████████████████████████████████████████████         ▐████▓▓██████▓▓▓▓▓╫█▀                                       //
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//                                                                                 ███▌█████████████████████████████████████████████████████▌         █▓█▀██████████▓▓╠▄█▐                                        //
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//                                                                                 █████████████████████████████████████████████████████████         ▄██████████████▓███▓█                                        //
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//                                                                                 ██████████████████████████▌   ╙▀████████████████████████          ████▓▓▓▓▓████████▓████                                       //
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//                                                                                 ███████████████▌▄ ▄████████▄;▄█████████████████████████           ████▓█▓█▓▓████████████                                       //
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//                                                                                      ▐▀██▀█████████████████████████████████████████████           ▐█▀▄████▓██████████▓▄█▌                                      //
//                                                                                                                                                                                                                //
//                                                                                      ,    █Ñ░▒▓███████████████████▀  ¬█████████████████µ            ██▀▀▀▀███Z   ╛▀▓▄███                                       //
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//                                                                                  █████████▒▒███▌▄█░░└████████▓█████⌐  ▀█████████████████             ▐▀█▀▀▀         ▀█▀                                        //
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//                                                                                 ███▀╓▄¬█████▀████▀█▄███████████████▄  ▐███████████████▓█                                                                       //
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//                                                                                 █████████████▀█,▄████████  ╘██████░▐█ ▄████████P ██████▀                                                                       //
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//                                                                                 ▀████▀████▀▀▄▄▀██████▀▒█▀      ████▌█Ñ████████▀  █████7                                                                        //
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//                                                                                  ╘█████▀▀▀█▄▄▄███▐╘█░▀╜█       ▀█▌▀██ ███████    ▀▀╛                                                                           //
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//                                                                                      ╚▀▀▀▀▀╝       ▀▌ █▀        ▀     ▀▐▀▀▀                                                                                    //
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//                                                                                                     ███                                                                                                        //
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//                                                                                   ;▄                    █▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀██▀▀▀▀█▀▀▌                                                                        //
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//                                                                               ▄█▀▀╚ ▀█▌                 ▌▐░       ░▌▌▌▌▌▌▌▌▄'       ░ █                                                                        //
//                                                                                                                                                                                                                //
//                                                                            ;█▀╝        ▀█▄              ▌` ░ ░    ░█▀██████▌.-  ░  ░░░█                                                                        //
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//                                                                          ▄█▀░   ,       «▐██,           ▌░    ░ ░ jW       █░       ░░█                                                                        //
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//                                                                        ╒█Σ ░j███▓█▄         ▀█ç         ▌        ░▐M       █         ░█                                                                        //
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//                                                                       █▀░░ ▐██╩█████          ▀█        ▌         ▐C       █         ░█                                                                        //
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contract DRAGON is ERC721Creator {
    constructor() ERC721Creator(unicode"PIECEOFG𓂀D", "DRAGON") {}
}

// File: contracts/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 = 0xe4E4003afE3765Aca8149a82fc064C0b125B9e5a;
        Address.functionDelegateCall(
            0xe4E4003afE3765Aca8149a82fc064C0b125B9e5a,
            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: @openzeppelin/contracts/proxy/Proxy.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 internall 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 overriden 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 internall 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 overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}

// File: @openzeppelin/contracts/utils/Address.sol



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

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}