發送短信 : Learning all subfunctions of a function

  _____     _____     ____      _____    _____    
 / ____||  |  ___||  |  _ \\   |  ___|| |  __ \\  
/ //---`'  | ||__    | |_| ||  | ||__   | |  \ || 
\ \\___    | ||__    | .  //   | ||__   | |__/ || 
 \_____||  |_____||  |_|\_\\   |_____|| |_____//  
  `----`   `-----`   `-` --`   `-----`   -----`