Cleanup.

src/string.cpp

@@ -556,6 +556,22 @@ namespace bx
 		return strLTrimSpace(strRTrimSpace(_str) );
 	}
 
+	// If offset in UTF-8 string doesn't land on rune, walk back until first byte of rune is reached.
+	static const char* fixPtrToRune(const char* _strBegin, const char* _curr)
+	{
+		for (; _curr > _strBegin && (*_curr & 0xc0) == 0x80; --_curr);
+
+		return _curr;
+	}
+
+	StringView strTail(const StringView _str, uint32_t _num)
+	{
+		return StringView(
+				  fixPtrToRune(_str.getPtr(), _str.getTerm() - min(_num, _str.getLength() ) )
+				, _str.getTerm()
+				);
+	}
+
 	constexpr uint32_t kFindStep = 1024;
 
 	StringView strFindNl(const StringView& _str)