Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are–by definition–not smart enough to debug it. Brian Kernighan
Write a program to pairwise swap the elements in the singly linked list. The singly linked list contain the data and link to next node in each node. Iterate each node from linked list and swap the nodes pairwise. Example 1->2->3-4>5 and result should be 2->1->3-4>5.
Print the list of items: 21->52->33->21->67->NULL Print the list of items after pairwise Swap: 52->21->21->33->67->NULL