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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.
Out of kata specs
That's fair; what would we expect to happen for those test cases? Just returning "Hello" probably makes sense.
This output is not very good.
There should be more tests, maybe empty strings, numbers, etc