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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
New StringBuffer is created for every word. I thinks it's better make it static and wrap into static method. More efficient.
Nice, but recommended best practice is to use StringBuilder instead of StringBuffer as it is thread-safe.
cool solution except one caveat here:
assertEquals("elppa ", Kata.reverseWords("apple "));
=> fails because trailing spaces are removed