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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.
the C code has been updated
Does your code pass the other tests?
People trying to solve the problem in "C" have noticed immutable memory being used, even though the argument type passed in is for a mutable string.