code: public static String readFileToString(String _file) {
          List<String> localText = getTextfileFromUrl(_file);
          if (localText == null) {
              return null;
          }
  
          return StringUtil.join(guessLineTerminatorOfFile(_file), localText);
      }
docs: Reads a file and returns it's content as string.
  
  @param _file
  @return