Warning "Function call causes an infinite recursion"

Function `urlWithUnicodeString(str: String)` calls itself. So it causes infinite recursion.
https://github.com/nysander/UnicodeURL/blob/fe15c8b585c2e6d22dfe81da899183e6aa376a93/Sources/UnicodeURL/URL%2BUnicode.swift#L25

<img width="773" alt="Screen Shot 2022-12-22 at 11 43 29" src="https://user-images.githubusercontent.com/19896354/209044021-ed282731-8009-44ba-9353-03a857b69cb3.png">
