$ ./mytest.pl

Your inventory contains: ( axe sword shovel )
Your storage contains:   ( knife wand bow )
Which item would you like to deposit? (blank to quit):  swwrd      
Please input a valid answer: ( axe sword shovel ).
Which item would you like to deposit? (blank to quit):  sword

Your inventory contains: ( axe shovel )
Your storage contains:   ( knife wand bow sword )
Which item would you like to deposit? (blank to quit):  axe

Your inventory contains: ( shovel )
Your storage contains:   ( knife wand bow sword axe )
Which item would you like to deposit? (blank to quit):  shovel

Now inventory and storage respectively contain:
(  )
( knife wand bow sword axe shovel )