Program 2 Revision History
| Date | Files | Description |
| 2may12 | writeup | Initial posting. |
| 6may12 | writeup | Clarified that substr match is one char at a time |
| 8may12 | writeup | Fixed typos in due date, size of input string, and sample run #2. The Due Date is Wed 9 May; the max size of the input string is 80 chars; the sample run input is xx abcdefg |