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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.
Renamed the offending test case.
I suppouse we should always remember to do null checks, even if the assigment specifically said the input will letters and spaces.
Always remember nullChecks!
Yes you are right. In real projects, it is better to check for NULL.
Use spoiler flag next time, please.