Implementing AMM router smart contracts

The AMM router is a smart contract for users and off-chain systems to access the DEX to perform activities including liquidity provisioning, liquidity removal, and token swapping. The AMM router accesses the functions in a pair factory and token pairs to perform these operations. In the process of implementing its code, we will also create several library functions to support the AMM router.

Let’s create the starter code for the AMMRouter smart contract by creating a new Solidity file located at src/backend/contracts/AMMRouter.sol, and implement the constructor of the smart contract like this:

address public override factory;
bytes32 private initCodeHash;
constructor(address _factory) {
    factory = _factory;
    initCodeHash = IPairFactory(factory).INIT_CODE_PAIR_HASH();
}

In the starter code of AMMRouter, we initialized the factory’s address and assigned initCodeHash within the...