Task 2: Fixed issue from previous checkin where a knights stamina was decreasing to 0 before his XP point was awarded. causing him not to get his XP point.

- Codalot.java
  - In method process, fixed bug where knight would sometimes not get awarded his XP point
  - Removed all tabs from file, replaced them with 4 spaces

 - CodalotTest.java
  - Added unit test for the scenario when a knight has 0 stamina points