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@Voile I made it even shorter (100 characters) ;-)
Very far from best, shortest solution ;-)
https://www.codewars.com/kata/reviews/5cfd374b9bde3400015aa0d3/groups/5d88ea1623ba730001d333aa
Oh, ZED always does stuff like that ;)
You can vote it as Clever of course.
There is a simple idea that involves playing with the letter 'Z'.
In description you can read: 'String lengths are less than 5000'
The tests are extremly complex. There are a few tests with over 1000 signs length. Optimation is the main problem in this Kata. To be honest I am strugling as well.