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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.
You forgot to return from test() and add its function prototype at the top, and add stdio.h
Python3 and Go are strongly missed here.