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    When I saw this problem I thought it was easy.When I started to do it, I found the rules that kata gave me were too hidden.And I can pass any test, including my own test in all cases.But when I submitted it, I found that the last test was always wrong, and when I printed his use case to the console, I found out,"a\n b\n c" return ""?WTF!For this reason, I am in a bad mood. I just want to say that this problem makes me very bored