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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.
This challenge works with every version of C language. You are approaching it incorrectly, not in a way how Codewars challenges should be solved. See if this article helps.
it uses different version of C language which would be different than what i use, i use C17 and somehow it isnt available here