Would be worth adding some tests. Also I kind of agree that leaving out the loop skeleton would make this a little more interesting.

I am not able to submit this kata. I copied several previous solutions, but it always gives me an "Unknown error."

EDIT: This may be because I am on a school computer with a very strict wifi. I will try at home and see what happens.

Take out the loop skeleton and update it so that the function can add an arbitrary number of empty arrays. Good beginner kata that might look harder than it is.

Seems to lack further test cases

The description isn't really clear.
You should switch the comment to the details part.

I would put a more appropriate and less-generic title.