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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 usually received
free()
error when my output was bad somehow. Inspect carefully what your code is doing and what it is trying to return (I think the culprit may simply be the absence of null pointer at the end of the string, but I can't tell for sure).