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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'm having the same problem, but with malloc I had garbage and with calloc I get 0,0. Not sure how to get the correct values.
I don't know what happens to your code since I tried a few solutions and all worked fine. Moreover you can see at the top of the page that 94 guys passed the C kata. Cheers.