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.
but They did not ask to change the current string , if they wnat to change it then there is no need for reterned
value .. other wize is to create a new string make a change of it and return a copy of it ..