test.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";


contract Test {
    address[] public routers;
    address[] public connectors;

    /**
      Gets router* and path* that give max output amount with input amount and tokens
      @param amountIn input amount
      @param tokenIn source token
      @param tokenOut destination token
      @return amountOut — max output amount and router and path, that give this output amount
      router* - Uniswap-like Router
      path* - token list to swap
     */
    function quote(
        uint amountIn,
        address tokenIn,
        address tokenOut
    ) external view returns (uint amountOut, address router, address[] memory path) {
        path = new address[](2);
        path[0] = tokenIn;
        path[1] = tokenOut;

        for(uint i; i<routers.length;i++) {
            uint amount = this.quoteForRouter(routers[i], amountIn, path);
            if (amount > amountOut) {
                amountOut = amount;
                router = routers[i];
            }
        }
    }

    function quoteForRouter(address router, uint amountIn, address[] memory  path) view public returns (uint256 amountOut) {
        uint[] memory amounts = IUniswapV2Router02(router).getAmountsOut(amountIn, path);
        amountOut = amounts[amounts.length - 1];
    }

    /**
      Swaps tokens on router with path, should check slippage
      @param amountIn input amount
      @param amountOutMin minumum output amount
      @param router Uniswap-like router to swap tokens on
      @param path tokens list to swap
      @return amountOut actual output amount
     */
    function swap(
        uint amountIn,
        uint amountOutMin,
        address router,
        address[] memory path
    ) external returns (uint amountOut) {
        require(amountOutMin > 0, "Amount out too low");
        uint[] memory amounts = IUniswapV2Router02(router).swapExactTokensForTokens(amountIn, amountOutMin, path, address(this), block.timestamp + 5);
        amountOut = amounts[amounts.length - 1];
    }
}