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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 your code crashes, it's a problem from your code and not a kata issue. Yes you have to allocate memory for your output, and the tests free the memory allocated for it. Maybe you should consider some edge cases that can cause problems. See if this can help you: https://docs.codewars.com/training/troubleshooting/.