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.
Clever solution, but you should use here StringBuilder object to create final string for better performance.
from description:
"The string has a length greater or equal to one and contains only letters from a to z."
I think that it is not an issue.