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.
Your solution has a bug, it does not handle some characters correctly. You need to read the description once again.
It is not a kata issue.
Without knowing what language you try, what is your code, and what is the input of the failed tests we have no way of knowing what you're doing wrong.
Look at what the input was.