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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 can just use a gcd implementation from num (num::integer::gcd)
Check my solution
Please correct me if I am wrong but in this case we pass the array by value and not by refrence so even if we change the array in the function, it should not change it in the envirmonment it was called. Right?