static void appendToTextFile(File file, String contents) ctex {
  File parentFile = file.getParentFile();
  if (parentFile != null)
    parentFile.mkdirs();
  if (contents != null) {
    FileOutputStream fileOutputStream = new FileOutputStream(file, true);
    OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream, "UTF-8");
    PrintWriter printWriter = new PrintWriter(outputStreamWriter);
    printWriter.print(contents);
    printWriter.close();
  }
}