Write a DLList method, absorb(12), that takes as an argument a DLList, 12, empties it and appends its contents, in order, to the receiver. For example, if 11 contains a,b,c and 12 contains d, e, f , then after calling 1 tabsorb(12), 11 will contain a,b,c,d,e, f and 12 will be empty.