Why uniswapV3FlashCallback() was not implemented?

[itsabinashb]

While adding Flash functionality we created IUniswapV3FlashCallback.sol interface and uniswapV3FlashCallback() inside it but we didn't implement the function anywhere in repository, why? If we don't implement the function it will not work, isn't it?

[F4r84D]

Create an interfaces folder and import them to pool contract —> IUniswapV3MintCallback.sol & IUniswapV3MintCallback.sol

//SPDX-License-Identifier: MIT

pragma solidity ^0.8.14;

interface IUniswapV3SwapCallback {
    function uniswapV3SwapCallback(int256 amount0, int256 amount1, bytes calldata data) external;
} 

And same for IUniswapV3MintCallback.sol