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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.
And anyways, there is a classic coding problem that does the same thing, it's called FizzBuzz, and there is already an existing kata of it
There are no mentions of what should be returned if input is not divisible by 3 or 5.
In fact, this isn't even tested.