19.6 (Concatenating Lists) Write a program that concatenates two linked list objects of characters. The program should include function
concatenate, which takes references to both list objects as arguments and concatenates the second list to the first list.
19.7 (Merging Ordered Lists) Write a program that merges two ordered list objects of integers into a single ordered list object of integers. Function
mergeshould receive references to each of the list objects to be merged and a reference to a list object into which the merged elements will be placed.
19.8 (Summing and Averaging Elements in a List) Write a program that inserts 25 random integers from 0 to 100 in order in a linked list object. The program should calculate ...