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.
Almost every answer just uses the upcase method to solve the problem. If the point is to write your own upcase method, using the existing upcase method in the solution shouldn't be alowed