commandStr - The string the user originally types in. To get the description of their current room it should simply be "look", to get the description of an item it should be "look [item name]"
public java.lang.String execute()
This method is used to give a description of the user's current room. It can also be used on an item to get the description of it.
Note: Rooms have two different kinds of descriptions.
A. Full descriptions are called on the first time entering a room, or with look commands. They contain the room's name, description(as in a short passage revealing what the room looks like) exits and items.
B. Short descriptions are called when the user enters a room they've already gone in before. They contain only the name, exits, and items sitting in it.