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.
Great, that you solved it! :-)
No, it seems, that you change the given array!
In the description it is said: "The input array should not be modified!"
In doubt post your code here (mark as spoiler) and we will try to find the problem.