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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 not sure if you figured it out, since you closed your question, but your solution does not handle rectangular (non-square) matrices
well to begin with, mutating the input is a very bad idea (both on Codewars and in JavaScript in general)