thank you

Hello,
I've just added another example in the description and also a few more tests (including random ones).

for me isn't clear how is encrypted a word, could you add more details?

Needs random tests ;-)

It seemed clear enough from the examples to me, but I added that part to the description too. Thanks for your feed :)

I still miss mentioning that we only look for reduced fractions between 0 and 1.

Fair enough: I added an edit at the end of the kata mentioning you; regrettably changing name, functions and more would give serious problems to the codewarrios who already solved it.

Sorry for the mishap!

Hi Giacomo,
You can find the two definitions on Wolfram MathWorld:
http://mathworld.wolfram.com/ProperFraction.html
http://mathworld.wolfram.com/ReducedFraction.html

Mh, good point, but I have seen conflicting ideas on this: can you point me some reference on it?

I think the definition is incorrect. A proper fraction is a fraction that is less than one while a reduced fraction is a fraction whose numerator and denominator are coprimes.

It's cool. I learned how to use zip function.