it seems he is working for Google and have no time to answer

very cool my boy

Your code does not conform to all specs and does not handle some cases correctly. In this paragraph you have some hints how to debug your solution. You can also read the description carefully again and make sure your solution handles all requirements.

It is a problem with the solution, not a kata issue (although I agree that the input is terrible).

It's difficult to help you without your code. (Please see documentation how to use code formatting)

I don't do C# but it seems that you are adding unicode characters between the alphabet positions in your solution.

Please do not raise issues without mentioning your language and showing your code. It's useless.

My code works for the first one, but the second test in the attempt is:
Test Failed
Assert.That(actual, Is.EqualTo(expected))
Expected string length 56 but was 90. Strings differ at index 0.
Expected: "17 21 5 10 4 23 8 4 3 21 22 24 15 12 2 6 13 1 19 7 18 25"
But was: "\u0004\u001c!417 \u0013\u0005\021 5 <\u00136410 4 23 8 \r/:4 3 21 \u001e]:\u000522 24 \v*(_\f\u001b15 12 ..."
-----------^

I don't think it is my codes fault.
(Please don't give me a trouble shoot guide and marked as solved. It is useless.)

yep got it.thanks

It's not absurd because random tests are never the same test ... because, well, they are random. That's why your code passes a different amount of them on each run of the ATTEMPT.

yes but the random tests passing is absurd, like a test in ATTEMPT at once is failing but if i run ATTEMPT again, the same test is now passed,why is that?

and by the way I un-flagged your comment as a spoiler because it did not discuss / reveal any solution concepts / code

Your code only passes all the sample tests.

On running ATTEMPT your code is tested by multiple random tests, and it does not pass all of them.

im having a problem where my code passed all the tests but in the attempt section each time i run the tests it shows different number of passed and failed test each time.
any reason or solution for that?

Latest Haskell version added random tests.

can someone explain it?