Reviewer comments included.

Hi Ariel,

You've done really well.

Here are a few notes:
   * Arrays can be defined more succinctly than one line per index.
   * printing multiple strings together may look okay, but can lead to problems when you attempt to use a single string later.
   * Be sure to think through string comparisons with generalized inputs.
   * Make your functions work!  You went through the effort of writing them...

I'll add some line-embedded comments after I submit the pull request.

-Sean