[PowerRename] Introduce advanced counter functionality (#27895)

src/common/utils/string_utils.h

@@ -54,3 +54,12 @@ inline void replace_chars(std::basic_string<CharT>& s,
         std::replace(begin(s), end(s), c, replacement_char);
     }
 }
+
+inline std::string unwide(const std::wstring& wide)
+{
+    std::string result(wide.length(), 0);
+    std::transform(begin(wide), end(wide), result.begin(), [](const wchar_t c) {
+        return static_cast<char>(c);
+    });
+    return result;
+}