def delete(key)
      c = @items[key]
      if c
        @items.delete(key)
        @list.each_index do |i|
  	      if @list[i] == key
  	        @list.delete_at(i)
  	        break
  	      end
        end
        c
      end
    end
def delete(key)
      c = @items[key]
      if c
        @items.delete(key)
        @list.each_index do |i|
  	      if @list[i] == key
  	        @list.delete_at(i)
  	        break
  	      end
        end
        c
      end
    end
Delete item from cache