發送短信 : Learning all subfunctions of a function

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