ex.sol

pragma solidity >= 0.4.22 < 0.6.0;

contract Contract {
    string public Name;

    constructor(string memory name) public {
        Name = name;
    }
    
    function getName() public view returns(string memory) {
        return Name;
    } 
}

contract Factory {
    
    Contract[] private contractList;

    event ContractCreated(string _name);

    function createContract (string memory _name) public {
        Contract newContract = new Contract(_name);
        contractList.push(newContract);
        emit ContractCreated(_name);
    }
    
    function getNameById(uint _id) public view returns(string memory){
        Contract con = contractList[_id];
        return con.getName();
    }
}