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.
You're right- I should have had the last line return null but my solution made it through the test cases so I didn't look too closely at it :/
You report finding the needle when there is no needle...