Contribute correction: Stock control

  ______   _    _     ______     ___    
 /_   _// | || | ||  /_   _//   / _ \\  
 `-| |,-  | || | ||    | ||    / //\ \\ 
   | ||   | \\_/ ||   _| ||   |  ___  ||
   |_||    \____//   /__//    |_||  |_||
   `-`'     `---`    `--`     `-`   `-`