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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.
it checks for a match of any characters or empty characters at the beginning, between letters, at the end.
i.e. ^^^c^h^^^^r^^i^^^^^s^ (^ -> something is there or empty)
The brain almost storming to count and understand the recursion call line ... bravo!
How could I forget about bitwise multiplication...thz
ah... the ball first falls, so before changing the height of the ball -1+2=1. pretty smart!