Problem 1: Reverse (10 points)

This method takes in a sentence as a parameter and returns the reverse of the sentence by word. For this particular problem, we will convert all our sentences to lowercase. The result should only return the strings separated by a single space, although the input may contain multiple spaces in between them.

Example: reverse("This is a SENTENCE") will return "sentence is a this".

reverse("This SENTENCE") will return "sentence this".