lol

Approved.

I didn't even know there's a thing like HashSet.

Thank you for mentioning it.
I think I changed everything you requested, would you mind taking another look?

You still lowercase vowel in the reference solution in the test class. Please also make that method private.

I meant to use a HashSet<char> for the vowels to have a better lookup but maybe this is not that necessary because it is a 7kyu after all and the examples are very short.

Thank you very much!
A lot more wrong than I thought.

• Changed the word.ToString() to new string(word)
• Deleted the Random Method and directly instanciated a Random Object
• Changed the for loop condition and the one for the random letter
• Added sample test cases (I don't know why they weren't there)
• Changed vocal to vowel
• No longer lower vowel

True, I will change that.

Why is vocal called that? It's vowel in English or Vokal in German.

• word.ToString() is not how you create a string from a char array. All random tests test the string "System.Char[]"
• Don't create a new Random object for every number. Instanciate it once and directly call Next()
• Condition in for loop should be j < word.Length
• To get a random letter, you need a number between 0 and buchstaben.Length.
• No sample test cases.
• Reference solution could use a Set or something for the vowel checks instead of a list.
• No need to lower vocal as it is already lowercase.

same

Seems familiar:
https://www.geeksforgeeks.org/padovan-sequence/