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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.
handled
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That's true, but the description states "Only valid Christmas dates will be passed to the solution" so I didn't bother coding that in.
you'd need a return statement in front of the string literal there if you did it that way; otherwise, it'd just throw away the result and proceed to return the last name.