wrote 2 new functions

combine() and check()

combine finds the player's desired combination if there and will usually
store the names of the needed items into a list and calls the function
check () with the list as an argument. The list returned from check() is
stored in a new variable and compared in size to the list of needed
items in terms of size. Function still needs to be finished so that the
items used are deleted and the newly created item is added.

check() function loops through all items in the inventory and compares
the current inventory item to all needed items, if they match the index
number for that item is placed into a list. When the loop is complete
the list of index number is returned.