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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.
*common
Ignore the "print(range_bit_count(4, 4))"
I was debugging with it, and forgot to remove it
In the kata description it's stated that the array is "non-empty". That means that there's always something in the array, thus the array lenght cannot be zero.