ESP32 LittleFS list files as URL

String processor2(const String& var)
{

	//index2.h

  String url;

  if (!LittleFS.begin())
  {
    Serial.println("LittleFS failed to mount !");
  }

  File root = LittleFS.open("/");

  File file = root.openNextFile();

  while(file)
  {

        String file_name = file.name();

        if (file_name.startsWith("LOG"))
        {
          
          url += "<a href=\"";
          url += file.name();
          url += "\">";
          url += file.name();
          url += "</a>";
          url += "    ";
          url += file.size();
          url += "<br>\r\n";

        } 

        file = root.openNextFile();       

  }

  root.close();

  if (var == F("URLLINK"))
    return  url;

  if (var == F("LINK"))
    return linkAddress;

  if (var == F("FILENAME"))
    return  file.name();

  return String();

}