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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.
Maybe some languages are less suited to this problem, but for C, it is definitely a beginner exercise.
i'm not sure how this solution passed the tests at some point, but it does not pass them anymore. you can try copying and pasting it into the trainer, it fails the tests every time