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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.
good idea
It's part of the task requirement
The warnings appeared when C was automatically updated to CLang8/C18. These warnings don't prevent you to pass the kata (they are only warnings) so it is not an issue (you can notice that 805 people passed the C kata). Nevertheless I modified the translation so that there are no more warnings but due - it seems - to CW problems I have not been able to republish the C translation. I will try later.
Update: at last C translation was re-published.