# Homework 25, challenge: build this string_utils module.
#
# Define at least three functions of your own design. Suggestions:
#   shout(s)           -- s in upper case with "!" appended
#   echo(s, n)         -- s repeated n times with spaces between
#   reverse_words(s)   -- words of s in reverse order
#
# The third one is a stretch. Pick something simpler if needed.

# Your functions go here: