svoid copyAllFilesInDirectory_rec(File src, File dest) {
  for (File f : listFiles(src)) {
    File destFile = newFile(dest, f.getName());
    if (isSymLink(f))
      Files.createLink(destFile, fileToPath(existingFile).toRealPath());
    else if (isFile(f))
      copyFile(f, destFile);
    else if (isDirectory(f)) {
      mkdirs(destFile);
      copyAllFilesInDirectory_rec(f, newFile(dest, f.getName()));
    }
  }
}