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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.
"Jump to the other side of the 5 on the keypad" is ambiguous , initially I replaced 1 <=> 3, 4 <=> 6 and 7 <=> 9 and was wondering what did I do wrong.
The output type in C is
char *but it's never tested that the function actually returns the correct pointer.