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.
I was having the same issue and resolved it by handling the case of one of the test cases being an empty string. Check at the start of your code if strng is empty and if so return an empty string.
Unfortunately I can't see your entire screenshot so I am unable to know what the problem is.
Better to say why you don't pass.
I think CW has problem now. You could try later or tell me your problem.