download video from youtube

void download_video(string url, int start, int end) {
  curl(url); // download video from youtube
  if (start != 0) {
    cut_start(start);
  }
  if (end != 0) {
    cut_end(end);
  }
  
}

download_video("https://www.youtube.com/watch?v=zO1wMd5r5QQ", 0, 0);