Hint to process a comment (lab 8)

• get the item from the command file
• find the location of it in the items file
• if the instruction is to display the stat, just call a method
• If the instruction is to add things to the stock of that item
  • get the amount from the command line
  • change the inventory file (send the line number, amount, name of inventory file, and name of output file)
• if the instruction is to remove things from inventory
  • get the amount from the command line and make it negative
  • change the inventory file (send the line number, amount, name of inventory file, and name of output file)