Write a function to reverse a linked list
Solutions:
 One solution could be take all element reverse using array until and replace with node value
 Second could be, move one step and set node next point to previous node
Algorithm:
 Set previous = null
 Iterate till we reached end of list

 temp = node.next
 node.next = previous
 previous = node
 node = temp
Latest Source Code:
Github: ReverseList.java
Output:
1 2 3 4 4 3 2 1 1 2 2 1