Course.sol

pragma solidity ^0.5.0;

contract CourseCreator {
    address creator;
    mapping(address => address) deployedAddress;

    constructor() public {
        creator = msg.sender;
    }

    function createCourse(uint256 deadline) public returns (address) {
        Course ob = new Course(deadline);
        deployedAddress[msg.sender] = address(ob);
        return address(ob);
    }

    function fetchCourseAddress() public view returns (address) {
        return deployedAddress[msg.sender];
    }

    function getCreator() public view returns (address) {
        return creator;
    }
}

contract Course {
    uint256 deadline;

    // mapping (address=>uint256) submissionTime;
    mapping(address => string) public fileHash;

    constructor(uint256 dl) public {
        deadline = dl;
    }

    function submit(string memory file) public {
        if (now < deadline) {
            fileHash[msg.sender] = file;
        }
    }
}