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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 thought it was a fun problem, but also felt it was probably a 5 or 6 kyu. I know that's feedback which has already been given.
If there isn't one already, I'd suggest a test case which has a single element array. Most base case conditions seem to use array.length==1, which has that kind of input as a potential vulnerability.