Code deduplication GetQuotedString()

Moved single function GetQuotedString() to MyString

Signed-off-by: Sergey G. Brester <info@sebres.de>
Reviewed-by: Tino Reichardt <milky-7zip@mcmilk.de>

CPP/Common/MyString.cpp

@@ -1803,3 +1803,13 @@ FString us2fs(const wchar_t *s)
 }
 
 #endif // USE_UNICODE_FSTRING
+
+// ----------------------------------------
+
+UString GetQuotedString(const UString &s)
+{
+  UString s2 ('\"');
+  s2 += s;
+  s2 += '\"';
+  return s2;
+}