1
{"DooarSwapV2Library.sol":{"content":"pragma solidity \u003e=0.5.0;\n\nimport \u0027../IDooarSwapV2Pair.sol\u0027;\n\nimport \"./SafeMath.sol\"
    ;\n\nlibrary DooarSwapV2Library {\n    using SafeMath for uint;\n\n    // returns sorted token addresses, used to handle return values from pairs 
    sorted in this order\n    function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {\n        
    require(tokenA != tokenB, \u0027DooarSwapV2Library: IDENTICAL_ADDRESSES\u0027);\n        (token0, token1) = tokenA \u003c tokenB ? (tokenA, tokenB) 
    : (tokenB, tokenA);\n        require(token0 != address(0), \u0027DooarSwapV2Library: ZERO_ADDRESS\u0027);\n    }\n\n    // calculates the CREATE2 
    address for a pair without making any external calls\n    function pairFor(address factory, address tokenA, address tokenB) internal pure returns 
    (address pair) {\n        (address token0, address token1) = sortTokens(tokenA, tokenB);\n        pair = address(uint(keccak256(abi.encodePacked(\n 
                   hex\u0027ff\u0027,\n                factory,\n                keccak256(abi.encodePacked(token0, token1)),\n                
    hex\u00278810cdfaaaa2c6c56fdebd83b2c9e7cc71e3ef06ec0c62e029c6476ff05136da\u0027 // init code hash\n            ))));\n    }\n\n    // fetches and 
    sorts the reserves for a pair\n    function getReserves(address factory, address tokenA, address tokenB) internal view returns (uint reserveA, uint 
    reserveB) {\n        (address token0,) = sortTokens(tokenA, tokenB);\n        (uint reserve0, uint reserve1,) = IDooarSwapV2Pair(pairFor(factory, 
    tokenA, tokenB)).getReserves();\n        (reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);\n    }\n\n    // 
    given some amount of an asset and pair reserves, returns an equivalent amount of the other asset\n    function quote(uint amountA, uint reserveA, 
    uint reserveB) internal pure returns (uint amountB) {\n        require(amountA \u003e 0, \u0027DooarSwapV2Library: INSUFFICIENT_AMOUNT\u0027);\n   
         require(reserveA \u003e 0 \u0026\u0026 reserveB \u003e 0, \u0027DooarSwapV2Library: INSUFFICIENT_LIQUIDITY\u0027);\n        amountB = amountA
    .mul(reserveB) / reserveA;\n    }\n\n    // given an input amount of an asset and pair reserves, returns the maximum output amount of the other 
    asset\n    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint amountOut) {\n        require(amountIn 
    \u003e 0, \u0027DooarSwapV2Library: INSUFFICIENT_INPUT_AMOUNT\u0027);\n        require(reserveIn \u003e 0 \u0026\u0026 reserveOut \u003e 0, 
    \u0027DooarSwapV2Library: INSUFFICIENT_LIQUIDITY\u0027);\n        uint amountInWithFee = amountIn.mul(99);\n        uint numerator = 
    amountInWithFee.mul(reserveOut);\n        uint denominator = reserveIn.mul(100).add(amountInWithFee);\n        amountOut = numerator / denominator
    ;\n    }\n\n    // given an output amount of an asset and pair reserves, returns a required input amount of the other asset\n    function 
    getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) internal pure returns (uint amountIn) {\n        require(amountOut \u003e 0, 
    \u0027DooarSwapV2Library: INSUFFICIENT_OUTPUT_AMOUNT\u0027);\n        require(reserveIn \u003e 0 \u0026\u0026 reserveOut \u003e 0, 
    \u0027DooarSwapV2Library: INSUFFICIENT_LIQUIDITY\u0027);\n        uint numerator = reserveIn.mul(amountOut).mul(100);\n        uint denominator = 
    reserveOut.sub(amountOut).mul(99);\n        amountIn = (numerator / denominator).add(1);\n    }\n\n    // performs chained getAmountOut 
    calculations on any number of pairs\n    function getAmountsOut(address factory, uint amountIn, address[] memory path) internal view returns 
    (uint[] memory amounts) {\n        require(path.length \u003e= 2, \u0027DooarSwapV2Library: INVALID_PATH\u0027);\n        amounts = new uint[](path
    .length);\n        amounts[0] = amountIn;\n        for (uint i; i \u003c path.length - 1; i++) {\n            (uint reserveIn, uint reserveOut) = 
    getReserves(factory, path[i], path[i + 1]);\n            amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut);\n        }\n    }\n\n   
     // performs chained getAmountIn calculations on any number of pairs\n    function getAmountsIn(address factory, uint amountOut, address[] memory 
    path) internal view returns (uint[] memory amounts) {\n        require(path.length \u003e= 2, \u0027DooarSwapV2Library: INVALID_PATH\u0027);\n     
       amounts = new uint[](path.length);\n        amounts[amounts.length - 1] = amountOut;\n        for (uint i = path.length - 1; i \u003e 0; i--) 
    {\n            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i - 1], path[i]);\n            amounts[i - 1] = getAmountIn(amounts[i]
    , reserveIn, reserveOut);\n        }\n    }\n}"},"DooarSwapV2Router02.sol":{"content":"pragma solidity =0.6.6;\n\nimport \u0027
    ./IDooarSwapV2Factory.sol\u0027;\nimport \u0027./TransferHelper.sol\u0027;\n\nimport \u0027./IDooarSwapV2Router02.sol\u0027;\nimport \u0027
    ./DooarSwapV2Library.sol\u0027;\nimport \u0027./SafeMath.sol\u0027;\nimport \u0027./IERC20.sol\u0027;\nimport \u0027./IWETH.sol\u0027;\n\ncontract 
    DooarSwapV2Router02 is IDooarSwapV2Router02 {\n    using SafeMath for uint;\n\n    address public immutable override factory;\n    address public 
    immutable override WETH;\n\n    modifier ensure(uint deadline) {\n        require(deadline \u003e= block.timestamp, \u0027DooarSwapV2Router: 
    EXPIRED\u0027);\n        _;\n    }\n\n    constructor(address _factory, address _WETH) public {\n        factory = _factory;\n        WETH = _WETH
    ;\n    }\n\n    receive() external payable {\n        assert(msg.sender == WETH); // only accept ETH via fallback from the WETH contract\n    }\n\n 
       // **** ADD LIQUIDITY ****\n    function _addLiquidity(\n        address tokenA,\n        address tokenB,\n        uint amountADesired,\n       
     uint amountBDesired,\n        uint amountAMin,\n        uint amountBMin\n    ) internal virtual returns (uint amountA, uint amountB) {\n        // 
    create the pair if it doesn\u0027t exist yet\n        if (IDooarSwapV2Factory(factory).getPair(tokenA, tokenB) == address(0)) {\n            
    IDooarSwapV2Factory(factory).createPair(tokenA, tokenB);\n        }\n        (uint reserveA, uint reserveB) = DooarSwapV2Library.getReserves
    (factory, tokenA, tokenB);\n        if (reserveA == 0 \u0026\u0026 reserveB == 0) {\n            (amountA, amountB) = (amountADesired, 
    amountBDesired);\n        } else {\n            uint amountBOptimal = DooarSwapV2Library.quote(amountADesired, reserveA, reserveB);\n            if 
    (amountBOptimal \u003c= amountBDesired) {\n                require(amountBOptimal \u003e= amountBMin, \u0027DooarSwapV2Router: 
    INSUFFICIENT_B_AMOUNT\u0027);\n                (amountA, amountB) = (amountADesired, amountBOptimal);\n            } else {\n                uint 
    amountAOptimal = DooarSwapV2Library.quote(amountBDesired, reserveB, reserveA);\n                assert(amountAOptimal \u003c= amountADesired);\n   
                 require(amountAOptimal \u003e= amountAMin, \u0027DooarSwapV2Router: INSUFFICIENT_A_AMOUNT\u0027);\n                (amountA, amountB) 
    = (amountAOptimal, amountBDesired);\n            }\n        }\n    }\n    function addLiquidity(\n        address tokenA,\n        address tokenB
    ,\n        uint amountADesired,\n        uint amountBDesired,\n        uint amountAMin,\n        uint amountBMin,\n        address to,\n        
    uint deadline\n    ) external virtual override ensure(deadline) returns (uint amountA, uint amountB, uint liquidity) {\n        (amountA, amountB) 
    = _addLiquidity(tokenA, tokenB, amountADesired, amountBDesired, amountAMin, amountBMin);\n        address pair = DooarSwapV2Library.pairFor(factory
    , tokenA, tokenB);\n        TransferHelper.safeTransferFrom(tokenA, msg.sender, pair, amountA);\n        TransferHelper.safeTransferFrom(tokenB, 
    msg.sender, pair, amountB);\n        liquidity = IDooarSwapV2Pair(pair).mint(to);\n    }\n    function addLiquidityETH(\n        address token,\n  
          uint amountTokenDesired,\n        uint amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline\n    ) 
    external virtual override payable ensure(deadline) returns (uint amountToken, uint amountETH, uint liquidity) {\n        (amountToken, amountETH) = 
    _addLiquidity(\n            token,\n            WETH,\n            amountTokenDesired,\n            msg.value,\n            amountTokenMin,\n      
          amountETHMin\n        );\n        address pair = DooarSwapV2Library.pairFor(factory, token, WETH);\n        TransferHelper.safeTransferFrom
    (token, msg.sender, pair, amountToken);\n        IWETH(WETH).deposit{value: amountETH}();\n        assert(IWETH(WETH).transfer(pair, amountETH));\n 
           liquidity = IDooarSwapV2Pair(pair).mint(to);\n        // refund dust eth, if any\n        if (msg.value \u003e amountETH) TransferHelper
    .safeTransferETH(msg.sender, msg.value - amountETH);\n    }\n\n    // **** REMOVE LIQUIDITY ****\n    function removeLiquidity(\n        address 
    tokenA,\n        address tokenB,\n        uint liquidity,\n        uint amountAMin,\n        uint amountBMin,\n        address to,\n        uint 
    deadline\n    ) public virtual override ensure(deadline) returns (uint amountA, uint amountB) {\n        address pair = DooarSwapV2Library.pairFor
    (factory, tokenA, tokenB);\n        IDooarSwapV2Pair(pair).transferFrom(msg.sender, pair, liquidity); // send liquidity to pair\n        (uint 
    amount0, uint amount1) = IDooarSwapV2Pair(pair).burn(to);\n        (address token0,) = DooarSwapV2Library.sortTokens(tokenA, tokenB);\n        
    (amountA, amountB) = tokenA == token0 ? (amount0, amount1) : (amount1, amount0);\n        require(amountA \u003e= amountAMin, 
    \u0027DooarSwapV2Router: INSUFFICIENT_A_AMOUNT\u0027);\n        require(amountB \u003e= amountBMin, \u0027DooarSwapV2Router: 
    INSUFFICIENT_B_AMOUNT\u0027);\n    }\n    function removeLiquidityETH(\n        address token,\n        uint liquidity,\n        uint 
    amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline\n    ) public virtual override ensure(deadline) returns 
    (uint amountToken, uint amountETH) {\n        (amountToken, amountETH) = removeLiquidity(\n            token,\n            WETH,\n            
    liquidity,\n            amountTokenMin,\n            amountETHMin,\n            address(this),\n            deadline\n        );\n        
    TransferHelper.safeTransfer(token, to, amountToken);\n        IWETH(WETH).withdraw(amountETH);\n        TransferHelper.safeTransferETH(to, 
    amountETH);\n    }\n    function removeLiquidityWithPermit(\n        address tokenA,\n        address tokenB,\n        uint liquidity,\n        
    uint amountAMin,\n        uint amountBMin,\n        address to,\n        uint deadline,\n        bool approveMax, uint8 v, bytes32 r, bytes32 s\n  
      ) external virtual override returns (uint amountA, uint amountB) {\n        address pair = DooarSwapV2Library.pairFor(factory, tokenA, tokenB);\n 
           uint value = approveMax ? uint(-1) : liquidity;\n        IDooarSwapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s
    );\n        (amountA, amountB) = removeLiquidity(tokenA, tokenB, liquidity, amountAMin, amountBMin, to, deadline);\n    }\n    function 
    removeLiquidityETHWithPermit(\n        address token,\n        uint liquidity,\n        uint amountTokenMin,\n        uint amountETHMin,\n        
    address to,\n        uint deadline,\n        bool approveMax, uint8 v, bytes32 r, bytes32 s\n    ) external virtual override returns (uint 
    amountToken, uint amountETH) {\n        address pair = DooarSwapV2Library.pairFor(factory, token, WETH);\n        uint value = approveMax ? uint(-1
    ) : liquidity;\n        IDooarSwapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);\n        (amountToken, amountETH) = 
    removeLiquidityETH(token, liquidity, amountTokenMin, amountETHMin, to, deadline);\n    }\n\n    // **** REMOVE LIQUIDITY (supporting fee-on
    -transfer tokens) ****\n    function removeLiquidityETHSupportingFeeOnTransferTokens(\n        address token,\n        uint liquidity,\n        
    uint amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline\n    ) public virtual override ensure(deadline) 
    returns (uint amountETH) {\n        (, amountETH) = removeLiquidity(\n            token,\n            WETH,\n            liquidity,\n            
    amountTokenMin,\n            amountETHMin,\n            address(this),\n            deadline\n        );\n        TransferHelper.safeTransfer(token
    , to, IERC20(token).balanceOf(address(this)));\n        IWETH(WETH).withdraw(amountETH);\n        TransferHelper.safeTransferETH(to, amountETH);\n 
       }\n    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(\n        address token,\n        uint liquidity,\n        uint 
    amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline,\n        bool approveMax, uint8 v, bytes32 r, bytes32 s\n 
       ) external virtual override returns (uint amountETH) {\n        address pair = DooarSwapV2Library.pairFor(factory, token, WETH);\n        uint 
    value = approveMax ? uint(-1) : liquidity;\n        IDooarSwapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);\n        
    amountETH = removeLiquidityETHSupportingFeeOnTransferTokens(\n            token, liquidity, amountTokenMin, amountETHMin, to, deadline\n        
    );\n    }\n\n    // **** SWAP ****\n    // requires the initial amount to have already been sent to the first pair\n    function _swap(uint[] 
    memory amounts, address[] memory path, address _to) internal virtual {\n        for (uint i; i \u003c path.length - 1; i++) {\n            (address 
    input, address output) = (path[i], path[i + 1]);\n            (address token0,) = DooarSwapV2Library.sortTokens(input, output);\n            uint 
    amountOut = amounts[i + 1];\n            (uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOut) : (amountOut, uint(0));\n     
           address to = i \u003c path.length - 2 ? DooarSwapV2Library.pairFor(factory, output, path[i + 2]) : _to;\n            IDooarSwapV2Pair
    (DooarSwapV2Library.pairFor(factory, input, output)).swap(\n                amount0Out, amount1Out, to, new bytes(0)\n            );\n        }\n  
      }\n    function swapExactTokensForTokens(\n        uint amountIn,\n        uint amountOutMin,\n        address[] calldata path,\n        address 
    to,\n        uint deadline\n    ) external virtual override ensure(deadline) returns (uint[] memory amounts) {\n        amounts = 
    DooarSwapV2Library.getAmountsOut(factory, amountIn, path);\n        require(amounts[amounts.length - 1] \u003e= amountOutMin, 
    \u0027DooarSwapV2Router: INSUFFICIENT_OUTPUT_AMOUNT\u0027);\n        TransferHelper.safeTransferFrom(\n            path[0], msg.sender, 
    DooarSwapV2Library.pairFor(factory, path[0], path[1]), amounts[0]\n        );\n        _swap(amounts, path, to);\n    }\n    function 
    swapTokensForExactTokens(\n        uint amountOut,\n        uint amountInMax,\n        address[] calldata path,\n        address to,\n        uint 
    deadline\n    ) external virtual override ensure(deadline) returns (uint[] memory amounts) {\n        amounts = DooarSwapV2Library.getAmountsIn
    (factory, amountOut, path);\n        require(amounts[0] \u003c= amountInMax, \u0027DooarSwapV2Router: EXCESSIVE_INPUT_AMOUNT\u0027);\n        
    TransferHelper.safeTransferFrom(\n            path[0], msg.sender, DooarSwapV2Library.pairFor(factory, path[0], path[1]), amounts[0]\n        );\n 
           _swap(amounts, path, to);\n    }\n    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline
    )\n        external\n        virtual\n        override\n        payable\n        ensure(deadline)\n        returns (uint[] memory amounts)\n    {\n 
           require(path[0] == WETH, \u0027DooarSwapV2Router: INVALID_PATH\u0027);\n        amounts = DooarSwapV2Library.getAmountsOut(factory, msg
    .value, path);\n        require(amounts[amounts.length - 1] \u003e= amountOutMin, \u0027DooarSwapV2Router: INSUFFICIENT_OUTPUT_AMOUNT\u0027);\n    
        IWETH(WETH).deposit{value: amounts[0]}();\n        assert(IWETH(WETH).transfer(DooarSwapV2Library.pairFor(factory, path[0], path[1]), 
    amounts[0]));\n        _swap(amounts, path, to);\n    }\n    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata 
    path, address to, uint deadline)\n        external\n        virtual\n        override\n        ensure(deadline)\n        returns (uint[] memory 
    amounts)\n    {\n        require(path[path.length - 1] == WETH, \u0027DooarSwapV2Router: INVALID_PATH\u0027);\n        amounts = DooarSwapV2Library
    .getAmountsIn(factory, amountOut, path);\n        require(amounts[0] \u003c= amountInMax, \u0027DooarSwapV2Router: EXCESSIVE_INPUT_AMOUNT\u0027);\n 
           TransferHelper.safeTransferFrom(\n            path[0], msg.sender, DooarSwapV2Library.pairFor(factory, path[0], path[1]), amounts[0]\n      
      );\n        _swap(amounts, path, address(this));\n        IWETH(WETH).withdraw(amounts[amounts.length - 1]);\n        TransferHelper
    .safeTransferETH(to, amounts[amounts.length - 1]);\n    }\n    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata 
    path, address to, uint deadline)\n        external\n        virtual\n        override\n        ensure(deadline)\n        returns (uint[] memory 
    amounts)\n    {\n        require(path[path.length - 1] == WETH, \u0027DooarSwapV2Router: INVALID_PATH\u0027);\n        amounts = DooarSwapV2Library
    .getAmountsOut(factory, amountIn, path);\n        require(amounts[amounts.length - 1] \u003e= amountOutMin, \u0027DooarSwapV2Router: 
    INSUFFICIENT_OUTPUT_AMOUNT\u0027);\n        TransferHelper.safeTransferFrom(\n            path[0], msg.sender, DooarSwapV2Library.pairFor(factory, 
    path[0], path[1]), amounts[0]\n        );\n        _swap(amounts, path, address(this));\n        IWETH(WETH).withdraw(amounts[amounts.length - 1]
    );\n        TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);\n    }\n    function swapETHForExactTokens(uint amountOut, address[] 
    calldata path, address to, uint deadline)\n        external\n        virtual\n        override\n        payable\n        ensure(deadline)\n        
    returns (uint[] memory amounts)\n    {\n        require(path[0] == WETH, \u0027DooarSwapV2Router: INVALID_PATH\u0027);\n        amounts = 
    DooarSwapV2Library.getAmountsIn(factory, amountOut, path);\n        require(amounts[0] \u003c= msg.value, \u0027DooarSwapV2Router: 
    EXCESSIVE_INPUT_AMOUNT\u0027);\n        IWETH(WETH).deposit{value: amounts[0]}();\n        assert(IWETH(WETH).transfer(DooarSwapV2Library.pairFor
    (factory, path[0], path[1]), amounts[0]));\n        _swap(amounts, path, to);\n        // refund dust eth, if any\n        if (msg.value \u003e 
    amounts[0]) TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0]);\n    }\n\n    // **** SWAP (supporting fee-on-transfer tokens) 
    ****\n    // requires the initial amount to have already been sent to the first pair\n    function _swapSupportingFeeOnTransferTokens(address[] 
    memory path, address _to) internal virtual {\n        for (uint i; i \u003c path.length - 1; i++) {\n            (address input, address output) = 
    (path[i], path[i + 1]);\n            (address token0,) = DooarSwapV2Library.sortTokens(input, output);\n            IDooarSwapV2Pair pair = 
    IDooarSwapV2Pair(DooarSwapV2Library.pairFor(factory, input, output));\n            uint amountInput;\n            uint amountOutput;\n            { 
    // scope to avoid stack too deep errors\n            (uint reserve0, uint reserve1,) = pair.getReserves();\n            (uint reserveInput, uint 
    reserveOutput) = input == token0 ? (reserve0, reserve1) : (reserve1, reserve0);\n            amountInput = IERC20(input).balanceOf(address(pair
    )).sub(reserveInput);\n            amountOutput = DooarSwapV2Library.getAmountOut(amountInput, reserveInput, reserveOutput);\n            }\n      
          (uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOutput) : (amountOutput, uint(0));\n            address to = i \u003c 
    path.length - 2 ? DooarSwapV2Library.pairFor(factory, output, path[i + 2]) : _to;\n            pair.swap(amount0Out, amount1Out, to, new bytes(0
    ));\n        }\n    }\n    function swapExactTokensForTokensSupportingFeeOnTransferTokens(\n        uint amountIn,\n        uint amountOutMin,\n   
         address[] calldata path,\n        address to,\n        uint deadline\n    ) external virtual override ensure(deadline) {\n        
    TransferHelper.safeTransferFrom(\n            path[0], msg.sender, DooarSwapV2Library.pairFor(factory, path[0], path[1]), amountIn\n        );\n   
         uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);\n        _swapSupportingFeeOnTransferTokens(path, to);\n        require(\n  
              IERC20(path[path.length - 1]).balanceOf(to).sub(balanceBefore) \u003e= amountOutMin,\n            \u0027DooarSwapV2Router: 
    INSUFFICIENT_OUTPUT_AMOUNT\u0027\n        );\n    }\n    function swapExactETHForTokensSupportingFeeOnTransferTokens(\n        uint amountOutMin,\n 
           address[] calldata path,\n        address to,\n        uint deadline\n    )\n        external\n        virtual\n        override\n        
    payable\n        ensure(deadline)\n    {\n        require(path[0] == WETH, \u0027DooarSwapV2Router: INVALID_PATH\u0027);\n        uint amountIn = 
    msg.value;\n        IWETH(WETH).deposit{value: amountIn}();\n        assert(IWETH(WETH).transfer(DooarSwapV2Library.pairFor(factory, path[0], 
    path[1]), amountIn));\n        uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);\n        _swapSupportingFeeOnTransferTokens(path, 
    to);\n        require(\n            IERC20(path[path.length - 1]).balanceOf(to).sub(balanceBefore) \u003e= amountOutMin,\n            
    \u0027DooarSwapV2Router: INSUFFICIENT_OUTPUT_AMOUNT\u0027\n        );\n    }\n    function swapExactTokensForETHSupportingFeeOnTransferTokens(\n   
         uint amountIn,\n        uint amountOutMin,\n        address[] calldata path,\n        address to,\n        uint deadline\n    )\n        
    external\n        virtual\n        override\n        ensure(deadline)\n    {\n        require(path[path.length - 1] == WETH, 
    \u0027DooarSwapV2Router: INVALID_PATH\u0027);\n        TransferHelper.safeTransferFrom(\n            path[0], msg.sender, DooarSwapV2Library
    .pairFor(factory, path[0], path[1]), amountIn\n        );\n        _swapSupportingFeeOnTransferTokens(path, address(this));\n        uint amountOut 
    = IERC20(WETH).balanceOf(address(this));\n        require(amountOut \u003e= amountOutMin, \u0027DooarSwapV2Router: INSUFFICIENT_OUTPUT_AMOUNT\u0027
    );\n        IWETH(WETH).withdraw(amountOut);\n        TransferHelper.safeTransferETH(to, amountOut);\n    }\n\n    // **** LIBRARY FUNCTIONS ****\n 
       function quote(uint amountA, uint reserveA, uint reserveB) public pure virtual override returns (uint amountB) {\n        return 
    DooarSwapV2Library.quote(amountA, reserveA, reserveB);\n    }\n\n    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut)\n       
     public\n        pure\n        virtual\n        override\n        returns (uint amountOut)\n    {\n        return DooarSwapV2Library.getAmountOut
    (amountIn, reserveIn, reserveOut);\n    }\n\n    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut)\n        public\n        
    pure\n        virtual\n        override\n        returns (uint amountIn)\n    {\n        return DooarSwapV2Library.getAmountIn(amountOut, reserveIn
    , reserveOut);\n    }\n\n    function getAmountsOut(uint amountIn, address[] memory path)\n        public\n        view\n        virtual\n        
    override\n        returns (uint[] memory amounts)\n    {\n        return DooarSwapV2Library.getAmountsOut(factory, amountIn, path);\n    }\n\n    
    function getAmountsIn(uint amountOut, address[] memory path)\n        public\n        view\n        virtual\n        override\n        returns 
    (uint[] memory amounts)\n    {\n        return DooarSwapV2Library.getAmountsIn(factory, amountOut, path);\n    }\n}"},"IDooarSwapV2Factory.sol"
    :{"content":"pragma solidity \u003e=0.5.0;\n\ninterface IDooarSwapV2Factory {\n    event PairCreated(address indexed token0, address indexed token1
    , address pair, uint);\n\n    function feeTo() external view returns (address);\n    function feeToSetter() external view returns (address);\n\n   
     function getPair(address tokenA, address tokenB) external view returns (address pair);\n    function allPairs(uint) external view returns (address 
    pair);\n    function allPairsLength() external view returns (uint);\n\n    function createPair(address tokenA, address tokenB) external returns 
    (address pair);\n\n    function setFeeTo(address) external;\n    function setFeeToSetter(address) external;\n}"},"IDooarSwapV2Pair.sol":{"content"
    :"pragma solidity \u003e=0.5.0;\n\ninterface IDooarSwapV2Pair {\n    event Approval(address indexed owner, address indexed spender, uint value);\n 
       event Transfer(address indexed from, address indexed to, uint value);\n\n    function name() external pure returns (string memory);\n    
    function symbol() external pure returns (string memory);\n    function decimals() external pure returns (uint8);\n    function totalSupply() 
    external view returns (uint);\n    function balanceOf(address owner) external view returns (uint);\n    function allowance(address owner, address 
    spender) external view returns (uint);\n\n    function approve(address spender, uint value) external returns (bool);\n    function transfer(address 
    to, uint value) external returns (bool);\n    function transferFrom(address from, address to, uint value) external returns (bool);\n\n    function 
    DOMAIN_SEPARATOR() external view returns (bytes32);\n    function PERMIT_TYPEHASH() external pure returns (bytes32);\n    function nonces(address 
    owner) external view returns (uint);\n\n    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 
    s) external;\n\n    event Mint(address indexed sender, uint amount0, uint amount1);\n    event Burn(address indexed sender, uint amount0, uint 
    amount1, address indexed to);\n    event Swap(\n        address indexed sender,\n        uint amount0In,\n        uint amount1In,\n        uint 
    amount0Out,\n        uint amount1Out,\n        address indexed to\n    );\n    event Sync(uint112 reserve0, uint112 reserve1);\n\n    function 
    MINIMUM_LIQUIDITY() external pure returns (uint);\n    function factory() external view returns (address);\n    function token0() external view 
    returns (address);\n    function token1() external view returns (address);\n    function getReserves() external view returns (uint112 reserve0, 
    uint112 reserve1, uint32 blockTimestampLast);\n    function price0CumulativeLast() external view returns (uint);\n    function price1CumulativeLast
    () external view returns (uint);\n    function kLast() external view returns (uint);\n\n    function mint(address to) external returns (uint 
    liquidity);\n    function burn(address to) external returns (uint amount0, uint amount1);\n    function swap(uint amount0Out, uint amount1Out, 
    address to, bytes calldata data) external;\n    function skim(address to) external;\n    function sync() external;\n\n    function initialize
    (address, address) external;\n}"},"IDooarSwapV2Router01.sol":{"content":"pragma solidity \u003e=0.6.2;\n\ninterface IDooarSwapV2Router01 {\n    
    function factory() external pure returns (address);\n    function WETH() external pure returns (address);\n\n    function addLiquidity(\n        
    address tokenA,\n        address tokenB,\n        uint amountADesired,\n        uint amountBDesired,\n        uint amountAMin,\n        uint 
    amountBMin,\n        address to,\n        uint deadline\n    ) external returns (uint amountA, uint amountB, uint liquidity);\n    function 
    addLiquidityETH(\n        address token,\n        uint amountTokenDesired,\n        uint amountTokenMin,\n        uint amountETHMin,\n        
    address to,\n        uint deadline\n    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);\n    function 
    removeLiquidity(\n        address tokenA,\n        address tokenB,\n        uint liquidity,\n        uint amountAMin,\n        uint amountBMin,\n  
          address to,\n        uint deadline\n    ) external returns (uint amountA, uint amountB);\n    function removeLiquidityETH(\n        address 
    token,\n        uint liquidity,\n        uint amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline\n    ) 
    external returns (uint amountToken, uint amountETH);\n    function removeLiquidityWithPermit(\n        address tokenA,\n        address tokenB,\n  
          uint liquidity,\n        uint amountAMin,\n        uint amountBMin,\n        address to,\n        uint deadline,\n        bool approveMax, 
    uint8 v, bytes32 r, bytes32 s\n    ) external returns (uint amountA, uint amountB);\n    function removeLiquidityETHWithPermit(\n        address 
    token,\n        uint liquidity,\n        uint amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline,\n        
    bool approveMax, uint8 v, bytes32 r, bytes32 s\n    ) external returns (uint amountToken, uint amountETH);\n    function swapExactTokensForTokens
    (\n        uint amountIn,\n        uint amountOutMin,\n        address[] calldata path,\n        address to,\n        uint deadline\n    ) external 
    returns (uint[] memory amounts);\n    function swapTokensForExactTokens(\n        uint amountOut,\n        uint amountInMax,\n        address[] 
    calldata path,\n        address to,\n        uint deadline\n    ) external returns (uint[] memory amounts);\n    function swapExactETHForTokens
    (uint amountOutMin, address[] calldata path, address to, uint deadline)\n        external\n        payable\n        returns (uint[] memory amounts
    );\n    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)\n        external\n   
         returns (uint[] memory amounts);\n    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, 
    uint deadline)\n        external\n        returns (uint[] memory amounts);\n    function swapETHForExactTokens(uint amountOut, address[] calldata 
    path, address to, uint deadline)\n        external\n        payable\n        returns (uint[] memory amounts);\n\n    function quote(uint amountA, 
    uint reserveA, uint reserveB) external pure returns (uint amountB);\n    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) 
    external pure returns (uint amountOut);\n    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint 
    amountIn);\n    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);\n    function 
    getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);\n}"},"IDooarSwapV2Router02.sol":{"content"
    :"pragma solidity \u003e=0.6.2;\n\nimport \u0027./IDooarSwapV2Router01.sol\u0027;\n\ninterface IDooarSwapV2Router02 is IDooarSwapV2Router01 {\n    
    function removeLiquidityETHSupportingFeeOnTransferTokens(\n        address token,\n        uint liquidity,\n        uint amountTokenMin,\n        
    uint amountETHMin,\n        address to,\n        uint deadline\n    ) external returns (uint amountETH);\n    function 
    removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(\n        address token,\n        uint liquidity,\n        uint amountTokenMin,\n        
    uint amountETHMin,\n        address to,\n        uint deadline,\n        bool approveMax, uint8 v, bytes32 r, bytes32 s\n    ) external returns 
    (uint amountETH);\n\n    function swapExactTokensForTokensSupportingFeeOnTransferTokens(\n        uint amountIn,\n        uint amountOutMin,\n     
       address[] calldata path,\n        address to,\n        uint deadline\n    ) external;\n    function 
    swapExactETHForTokensSupportingFeeOnTransferTokens(\n        uint amountOutMin,\n        address[] calldata path,\n        address to,\n        
    uint deadline\n    ) external payable;\n    function swapExactTokensForETHSupportingFeeOnTransferTokens(\n        uint amountIn,\n        uint 
    amountOutMin,\n        address[] calldata path,\n        address to,\n        uint deadline\n    ) external;\n}"},"IERC20.sol":{"content":"pragma 
    solidity \u003e=0.5.0;\n\ninterface IERC20 {\n    event Approval(address indexed owner, address indexed spender, uint value);\n    event Transfer
    (address indexed from, address indexed to, uint value);\n\n    function name() external view returns (string memory);\n    function symbol() 
    external view returns (string memory);\n    function decimals() external view returns (uint8);\n    function totalSupply() external view returns 
    (uint);\n    function balanceOf(address owner) external view returns (uint);\n    function allowance(address owner, address spender) external view 
    returns (uint);\n\n    function approve(address spender, uint value) external returns (bool);\n    function transfer(address to, uint value) 
    external returns (bool);\n    function transferFrom(address from, address to, uint value) external returns (bool);\n}"},"IWETH.sol":{"content"
    :"pragma solidity \u003e=0.5.0;\n\ninterface IWETH {\n    function deposit() external payable;\n    function transfer(address to, uint value) 
    external returns (bool);\n    function withdraw(uint) external;\n}"},"SafeMath.sol":{"content":"pragma solidity =0.6.6;\n\n// a library for 
    performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)\n\nlibrary SafeMath {\n    function add(uint x, uint y) 
    internal pure returns (uint z) {\n        require((z = x + y) \u003e= x, \u0027ds-math-add-overflow\u0027);\n    }\n\n    function sub(uint x, uint 
    y) internal pure returns (uint z) {\n        require((z = x - y) \u003c= x, \u0027ds-math-sub-underflow\u0027);\n    }\n\n    function mul(uint x, 
    uint y) internal pure returns (uint z) {\n        require(y == 0 || (z = x * y) / y == x, \u0027ds-math-mul-overflow\u0027);\n    }\n}"}
    ,"TransferHelper.sol":{"content":"// SPDX-License-Identifier: GPL-3.0-or-later\n\npragma solidity \u003e=0.6.0;\n\n// helper methods for 
    interacting with ERC20 tokens and sending ETH that do not consistently return true/false\nlibrary TransferHelper {\n    function safeApprove(\n    
        address token,\n        address to,\n        uint256 value\n    ) internal {\n        // bytes4(keccak256(bytes(\u0027approve(address,uint256
    )\u0027)));\n        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));\n        require(\n            
    success \u0026\u0026 (data.length == 0 || abi.decode(data, (bool))),\n            \u0027TransferHelper::safeApprove: approve failed\u0027\n        
    );\n    }\n\n    function safeTransfer(\n        address token,\n        address to,\n        uint256 value\n    ) internal {\n        // bytes4
    (keccak256(bytes(\u0027transfer(address,uint256)\u0027)));\n        (bool success, bytes memory data) = token.call(abi.encodeWithSelector
    (0xa9059cbb, to, value));\n        require(\n            success \u0026\u0026 (data.length == 0 || abi.decode(data, (bool))),\n            
    \u0027TransferHelper::safeTransfer: transfer failed\u0027\n        );\n    }\n\n    function safeTransferFrom(\n        address token,\n        
    address from,\n        address to,\n        uint256 value\n    ) internal {\n        // bytes4(keccak256(bytes(\u0027transferFrom(address,address
    ,uint256)\u0027)));\n        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));\n        require
    (\n            success \u0026\u0026 (data.length == 0 || abi.decode(data, (bool))),\n            \u0027TransferHelper::transferFrom: transferFrom 
    failed\u0027\n        );\n    }\n\n    function safeTransferETH(address to, uint256 value) internal {\n        (bool success, ) = to.call{value: 
    value}(new bytes(0));\n        require(success, \u0027TransferHelper::safeTransferETH: ETH transfer failed\u0027);\n    }\n}"}}
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// Copyright (C) 2015, 2016, 2017 Dapphub
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.4.18;
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pragma solidity ^0.4.24;
// File: zos-lib/contracts/upgradeability/Proxy.sol
/**
 * @title Proxy
 * @dev Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 */
contract Proxy {
  /**
   * @dev Fallback function.
   * Implemented entirely in `_fallback`.
   */
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// contracts/GreenMetaverseToken.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
/**
 * Green Metaverse Token
 * @author STEPN
 */
contract GreenMetaverseToken is ERC20, ERC20Burnable, Ownable {
    constructor() ERC20("GreenMetaverseToken", "GMT") {}
    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }
    function decimals() public view virtual override returns (uint8) {
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/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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