Converts a Unicode code point to a narrow string in UTF-8 encoding. code_point parameter is of type UInt32 because wchar_t may not be wide enough to contain a code point. The output buffer str must containt at least 32 characters. The function returns the address of the output buffer. If the code_point is not a valid Unicode code point (i.e. outside of Unicode range U+0 to U+10FFFF) it will be out
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