First of all, why 'M' is '@'? Please look at the samples for C#. Next, In my IDE, character 'M' is translated into '@', but here it always stay 'Z'

"MEXICAAAAAAAANS GOOOO HOOOMEEEE", 2.50

Why do we have here 2.5? The number of extra vowels is 15, in 4 groups (according to description, we need to cound groups of vowels). When we divide 15 by 4, we get 3.75. How did you get 2.5?

Cool kata, but I think it should be 8 kyu

Testing for [-7, 9, -8, -2, 2, 2, -4, -2, 1, -4, 7, 0, -8, -3, 9, -1, 10, -2, 6, 10, -5, 10, 0, 4, -2, 10, -2, -4, -7, 2, 4, -5] and 11
Expected: equal to [ -7, -8, -2, -4, -4, -8, -3, -5, -4, -7, -5 ]

Why is here on "expected" field I see "-7, -8, -2, -4, -4 ..."?
If I'm not mistaken, the answer should be "-7, -8, -2, -4, -2, -4 ..." as on the top we see that in a consecutive number -2 going before the second -4