Add base file for homework #5
Add exercise #5.1 racketlist->mupllist
solution of problem 5.2. mupllist->racketlist
Add Exercise #5.2
Add Exercise #5.3
Add exercise #5.4
Initial file for homework #6
Add entry to gitignore
Add first two part of homework #6
remove useless comments
Add cheat key 'c' into the game
fix first extra piece
fix cheat condition