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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.
I am very sorry, the C tests are not broken. Not only 40 ppl passed this test but it is common to all languages so 868 ppl passed it. I tried many C solutions and all were fine. I am afraid something is wrong in your code. I also tried your solution with other tests taken from "ATTEMPT" and you fail every one. Cheers.