Rewrote initial data preparation as functions.
Broke trigrams.py from only a script into functions.
Completed breaking trigrams.py into functions.
Changed line 23 to use enumerate() and removed non-meaningful else: in line 43.
Created global variables to hold strings for menu outputs.
Temporarily removed safe_input() and permanently removed unecessary print statement previously on line 94.
Modified logic to allow shorter input.
Changed name input to invalidate entries consisting of only numbers.
Finished adding docstrings to public functions and adjusting file opening and donor name procedures.