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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.
OP solved the kata (while still returning a stack array from the function, remarkably)
Your solution returns a buffer which is allocated on the stack, what is an error in C. Your answer needs to be accessible for tests, so you need to return a pointer to a buffer which lives longer than just a call to the solution function.