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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.
Its deadly in C :(
In fact, making full use of a language's API is a good idea. There is usually no need to manually do easy jobs, such as sorting or reversing a string, in real life if we have an API function to do that.