Prevent storing unnecessary extra data

The application is storing more information than is necessary. In particular, when the user enters `DONE` it is currently saving that as the last item in the list. When it prints out the list, it prints out everything besides the last item.

This is a sloppy solution.

Let's fix how we handle it so that:

* When the user enters `DONE` that value is *NOT* added to the list of favorites
* When printing the list of favorites, print the entire list