Hi, thank you for sharing your work around. But in this case when I print the original incoming string, I can see that it does not contain '\t' at all, yet it is expected in the output string. I am not sure why?

I got the same and "solved" it by including \t as an acceptable character. It's a bit weird.

One of the tests expects special characters to be retained, such as ~ / \ and others. Please fix the task, or remove this test?