CodeTest

1. CarnegieLearning: OOD problem. I provided solution with creating models: User, Skill and Problem. In Skill model, I overrided hashcode() and equals() methods so that I can use Skill as key in the User's map<Skill, Integer>.

2. ConcatingWords: Provided a solution based on trie.

3. 3D Tic-Tac-Toe HMI program

4. Implement log processor, which includes simple mechanism of log rotation.