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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.
Your code has an obvious error, I saw it at first glance. Not to presume anything, but just review your code carefully and you will find.
it might be that you are returning a array of 0's, while you are supposed to return an empty array. remember that even zeros count as elements in an array. (to return a empty array, try this : return new int[0];)