LGTM, approved

I've completed it, very nice kata ! love it.. Good job to everyone who done it too ^^

Print the input: https://docs.codewars.com/training/troubleshooting#print-input

A problem with your code is not a kata issue.

My code solves all three test cases provided in the task/kata. However, when I click the "submit"-button it does not solve the author's test cases, which I am not able to see. How am I supposed to solve this issue?

The "==" should be "===", in order to be the strictest possible.

C translation (author gone)

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Factor translation

updated

Ruby 3.0 should be enabled, see this to learn how to do it

Please organize the structure of test fixture as following (although it has been mentioned in the attached link, I'm repeated here again)

describe "<This message should describe the categories of test groups inside this block>" do
  it "<A short message describing this test group>" do
    expect(...).to eq(...) #Assertions
    #Or Test.assert_equals(user_response, reference_response)
  end
end

Forked python translation with 3.8 enabled & new test framework used

Let's not*. I merely mentioned what can be done, I did not claim it is good practice. Understanding why it works might however lead to useful insights, or give you ideas when playing code golf.

which instantly makes it harder to read, so lets dont do that.