Refactored file structure.

contracts/Ownable.sol

@@ -1,38 +0,0 @@
-pragma solidity ^0.5.2;
-
-/**
- * @title Ownable
- * @dev The Ownable contract has an owner address, and provides basic authorization control
- * functions, this simplifies the implementation of "user permissions".
- */
-contract Ownable {
-    address public owner;
-
-    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
-
-    /**
-     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
-     * account.
-     */
-    constructor() public {
-        owner = msg.sender;
-    }
-
-    /**
-     * @dev Throws if called by any account other than the owner.
-     */
-    modifier onlyOwner() {
-        require(msg.sender == owner, "Only owner accessible");
-        _;
-    }
-
-    /**
-     * @dev Allows the current owner to transfer control of the contract to a newOwner.
-     * @param newOwner The address to transfer ownership to.
-     */
-    function transferOwnership(address newOwner) public onlyOwner {
-        require(newOwner != address(0), "Address not equal to zero");
-        emit OwnershipTransferred(owner, newOwner);
-        owner = newOwner;
-    }
-}