added steps back, now back to solving the excercise
check against ASCII characters for letters, print negative message for empty letter array or only one letter
cleaned up comments
removed test outputs, renamed variable
walk through the letters array
lowercase letters so mixed case palindromes are interpreted correctly
cleaned up comments, replaced break with exit (non-matching characters)
being a good GitHubber - adding a licence
Merge branch 'master' of github.com:kerstin/fhtw-gpr