Contribute correction: Stock control

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