Swap the kth node from both ends in linked list

This is the interesting problem of linked list, swap a node that exists in kth distance from either end. This means swaping a node that are include at k distance from the beginning and k distance from the end. For example.

Example 1
----------
    List    1 → 2 → 5 → 4 → 3 → 6 → 7 → NULL
    k = 2
    Swap node
            1 → 2 → 5 → 4 → 3 → 6 → 7 → NULL

                ↑               ↑
    -----------------------------------------
Output :    1 → 6 → 5 → 4 → 3 → 2 → 7 → NULL


Example 2
----------
    List    6 → 3 → 2 → 1 → NULL
    k = 4
    Swap node
            6 → 3 → 2 → 1 → NULL

            ↑           ↑
          4-th node    4-th node
          from end     from start
    -----------------------------------------
Output :    1 → 3 → 2 → 6 → NULL

Example 3
----------
    List    1 → 2 → 3 → 4 → NULL
    k = 3
    Swap node
            1 → 2 → 3 → 4 → NULL
               ⤶    ⤷  
       3-rd node      3-rd node 
       from end       from start
           
    -----------------------------------------
Output :    1 → 3 → 2 → 6 → NULL

We assume given node position are valid. And update the node link, not swap node data value.

Here given code implementation process.

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