Nice recursive solution. I didn't think of this solution. It took me some time to understand what the creator of the Kata meant. The description was kinda vague.

It is a good solution. I would suggest that you do: input.ToLower() .ToCharArray() .ToList() etc. Then you have more readable code. If you look at my solution you see how it can be achieved without using the dictionary. But it is still a good solution :-)

Your solution looks almost as mine only i would recommend to implement the transformations as extensions :) looks more clean. For the rest good job!

Sweet! Same solution :)

Thank you for pointing that out! I'll have a look ...

Damn, I didn't think about this approach. This is going to my favourites! Love the LINQ style :-) ...

Thanks! My goal was to make the entrance code as clean as possible and really easy to read.

Good point, its indeed a sum and not an assignment.

Same solution? Ha! Ur looks fine to me as well :-)!

Thanks for the feedback, good point. I wasn't aware of that.