Yes UB indeed, I just went with obfuscation mode. (-:

Ahh nice. I had pretty much the same idea for the solution, was short on sleep and too tired to implement. :D

Clever!

Any reason for 6 + ~ir instead of 5 - ir ?

chars argument is a pointer to a constant characters i.e., you cannot modify the contents of address to which it points to but can modify what string it points to

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Beautiful two katas, absolutely loved them. (:

you can use a letter the number of times it is in the second string.

Great kata, solved non-recursively!

Loved the kata, I painstakingly wrote all the code and all green on the first attempt (:

P.S the kata is a bit harder than 6 kyu.

A great series finished! (: