Create3 Solidity

create3.sol

pragma solidity 0.8.18;
import "https://github.com/0xsequence/create3/contracts/Create3.sol";

contract Child {
    uint8 public a;
    function hola() public {
        a = 5;
    }
}

contract Deployer {
    address public addr;
    event isCon(bool con);


    function deployChild() external {
        addr = Create3.create3(
            keccak256(bytes("<my salt>")),
            type(Child).creationCode
        );
    }

    function isContract(address _addr) public {
        uint32 size;
        assembly {
            size := extcodesize(_addr)
        }
        emit isCon(size > 0);
    }

}