Reverse a Link List

ReverseSLL.cs

public class Solution{
  
  public ListNode ReverseLinkList(ListNode head){
    
    if(head == null) return null;
    
    ListNode current = head;
    ListNode prev = null;
    ListNode reverseHead = null;
    
    while(current != null){
      
      var currentNext = current.next;
      if(currentNext == null)
        reverseHead = current;
        
      current.next = prev;
      prev = current;
      current = currentNext;
    }
    
    return reverseHead;
  }
  
}