def full_name
      the_name = []
      the_name << parent.full_name if parent&.full_name
      the_name << name
      the_name.join(" ")
    end
def full_name
      the_name = []
      the_name << parent.full_name if parent&.full_name
      the_name << name
      the_name.join(" ")
    end
Public: Get the name of the current command plus that of
   its parent commands

 Returns the full name of the command