Loading collection data...
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.
it's just a presumption in real-life coding aspect but CW is not a real-life coding website, so closing!
In which language does that happen?
It would be nice if the instructions included something about how the function should behave if it's given a non-string input.