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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.
That's not indicative of a kata issue, since it doesn't take spelling into account. If you think a test case is wrong then keep in mind that it only makes sense to talk about wrong answer if you include the test input.