removed unnecessary dependicies

.gitmodules

@@ -9,6 +9,3 @@
 [submodule "lib/openzeppelin-contracts"]
 	path = lib/openzeppelin-contracts
 	url = https://github.com/OpenZeppelin/openzeppelin-contracts
-[submodule "lib/v2-core"]
-	path = lib/v2-core
-	url = https://github.com/Uniswap/v2-core

src/libraries/IUniswapV2Pair.sol

@@ -0,0 +1,53 @@
+//SPDX-License-Identifier: MIT
+pragma solidity >=0.8.21;
+
+interface IUniswapV2Pair {
+    event Approval(address indexed owner, address indexed spender, uint value);
+    event Transfer(address indexed from, address indexed to, uint value);
+
+    function name() external pure returns (string memory);
+    function symbol() external pure returns (string memory);
+    function decimals() external pure returns (uint8);
+    function totalSupply() external view returns (uint);
+    function balanceOf(address owner) external view returns (uint);
+    function allowance(address owner, address spender) external view returns (uint);
+
+    function approve(address spender, uint value) external returns (bool);
+    function transfer(address to, uint value) external returns (bool);
+    function transferFrom(address from, address to, uint value) external returns (bool);
+
+    function DOMAIN_SEPARATOR() external view returns (bytes32);
+    function PERMIT_TYPEHASH() external pure returns (bytes32);
+    function nonces(address owner) external view returns (uint);
+
+    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
+
+    event Mint(address indexed sender, uint amount0, uint amount1);
+    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
+    event Swap(
+        address indexed sender,
+        uint amount0In,
+        uint amount1In,
+        uint amount0Out,
+        uint amount1Out,
+        address indexed to
+    );
+    event Sync(uint112 reserve0, uint112 reserve1);
+
+    function MINIMUM_LIQUIDITY() external pure returns (uint);
+    function factory() external view returns (address);
+    function token0() external view returns (address);
+    function token1() external view returns (address);
+    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
+    function price0CumulativeLast() external view returns (uint);
+    function price1CumulativeLast() external view returns (uint);
+    function kLast() external view returns (uint);
+
+    function mint(address to) external returns (uint liquidity);
+    function burn(address to) external returns (uint amount0, uint amount1);
+    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
+    function skim(address to) external;
+    function sync() external;
+
+    function initialize(address, address) external;
+}

src/libraries/SafeMath.sol

@@ -1,17 +1,17 @@
-pragma solidity =0.6.6;
+pragma solidity >= 0.8.21;
 
 // a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)
 
 library SafeMath {
     function add(uint x, uint y) internal pure returns (uint z) {
-        require((z = x + y) >= x, 'ds-math-add-overflow');
+        require((z = x + y) >= x, "ds-math-add-overflow");
     }
 
     function sub(uint x, uint y) internal pure returns (uint z) {
-        require((z = x - y) <= x, 'ds-math-sub-underflow');
+        require((z = x - y) <= x, "ds-math-sub-underflow");
     }
 
     function mul(uint x, uint y) internal pure returns (uint z) {
-        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
+        require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
     }
 }

src/libraries/UniswapV2Library.sol

@@ -1,17 +1,17 @@
-pragma solidity >=0.5.0;
-
-import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol';
+//SPDX-License-Identifier: MIT
+pragma solidity >= 0.8.21;
 
+import "./IUniswapV2Pair.sol";
 import "./SafeMath.sol";
 
 library UniswapV2Library {
     using SafeMath for uint;
 
     // returns sorted token addresses, used to handle return values from pairs sorted in this order
     function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
-        require(tokenA != tokenB, 'UniswapV2Library: IDENTICAL_ADDRESSES');
+        require(tokenA != tokenB, "UniswapV2Library: IDENTICAL_ADDRESSES");
         (token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
-        require(token0 != address(0), 'UniswapV2Library: ZERO_ADDRESS');
+        require(token0 != address(0), "UniswapV2Library: ZERO_ADDRESS");
     }
 
     // calculates the CREATE2 address for a pair without making any external calls
@@ -34,15 +34,15 @@ library UniswapV2Library {
 
     // given some amount of an asset and pair reserves, returns an equivalent amount of the other asset
     function quote(uint amountA, uint reserveA, uint reserveB) internal pure returns (uint amountB) {
-        require(amountA > 0, 'UniswapV2Library: INSUFFICIENT_AMOUNT');
-        require(reserveA > 0 && reserveB > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
+        require(amountA > 0, "UniswapV2Library: INSUFFICIENT_AMOUNT");
+        require(reserveA > 0 && reserveB > 0, "UniswapV2Library: INSUFFICIENT_LIQUIDITY");
         amountB = amountA.mul(reserveB) / reserveA;
     }
 
     // given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
     function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint amountOut) {
-        require(amountIn > 0, 'UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT');
-        require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
+        require(amountIn > 0, "UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT");
+        require(reserveIn > 0 && reserveOut > 0, "UniswapV2Library: INSUFFICIENT_LIQUIDITY");
         uint amountInWithFee = amountIn.mul(997);
         uint numerator = amountInWithFee.mul(reserveOut);
         uint denominator = reserveIn.mul(1000).add(amountInWithFee);
@@ -51,16 +51,16 @@ library UniswapV2Library {
 
     // given an output amount of an asset and pair reserves, returns a required input amount of the other asset
     function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) internal pure returns (uint amountIn) {
-        require(amountOut > 0, 'UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT');
-        require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
+        require(amountOut > 0, "UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT");
+        require(reserveIn > 0 && reserveOut > 0, "UniswapV2Library: INSUFFICIENT_LIQUIDITY");
         uint numerator = reserveIn.mul(amountOut).mul(1000);
         uint denominator = reserveOut.sub(amountOut).mul(997);
         amountIn = (numerator / denominator).add(1);
     }
 
     // performs chained getAmountOut calculations on any number of pairs
     function getAmountsOut(address factory, uint amountIn, address[] memory path) internal view returns (uint[] memory amounts) {
-        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
+        require(path.length >= 2, "UniswapV2Library: INVALID_PATH");
         amounts = new uint[](path.length);
         amounts[0] = amountIn;
         for (uint i; i < path.length - 1; i++) {
@@ -71,7 +71,7 @@ library UniswapV2Library {
 
     // performs chained getAmountIn calculations on any number of pairs
     function getAmountsIn(address factory, uint amountOut, address[] memory path) internal view returns (uint[] memory amounts) {
-        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
+        require(path.length >= 2, "UniswapV2Library: INVALID_PATH");
         amounts = new uint[](path.length);
         amounts[amounts.length - 1] = amountOut;
         for (uint i = path.length - 1; i > 0; i--) {