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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.
If you're talking about the attempt it's working fine. I just finished it a few minutes ago. The other two test cases are to make sure your solution actually works. I'm hinting towards the hint here as they also test if you handled what the hint specified. I was stuck on that and thought just like you it was broken till I really thought about the hint again. If you look at the stack trace and see something other than NPE then this doesn't apply, else it does.
Print the input.