Phases
1. Plain text - determine symbol frequency
2. Frequencies - fill array of Tree Nodes
3. Array - collapse into a single Binary Tree
4. Walk tree - scheme = codeword of symbol
5. Encode - output is the input to decode

Steps
1. Your solution source code should be a single C-file on the syslab filesystem.
2. Make a copy of this C-file named yourusername.c for whatever your username is.
3. At the top, include a comment with your name, today's date, class period.
4. Also in the same comment, indicated how far you got: Phase 3 finished, etc.
5. Put this file in ~smtorbert/turnin using either...
      cp yourusername.c ~smtorbert/turnin
            -or-
      mv yourusername.c ~smtorbert/turnin