URL Tracker with Stack

Create a URL Tracker that allows for navigation through websites using a simple command interface. You can go to a new URL with 'visit URL', and you can go back to the last URL with 'back'. If the back command is invoked and there are no previous URLs, return 'No URL to go back to'. Implement the tracker so that the 'back' command only returns the last URL, it should not keep a stack of visited URLs. Input Format: - Multiple commands, each being either 'visit URL' or 'back'. The first command will always be a 'visit'. Output Format: - Return the most recent URL or a message if no URL is available. Example: Input: visit example.com visit google.com back visit stackoverflow.com back back Output: google.com example.com