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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.
I think you have a problem in your recursion: not tail recursive or bad re-initialization of your variables. If it works locally it will work at CW. Print some output to see what happens.
Is your recursion too deep?