Remove Nth Node From End of List

 1#include<stdio.h>
 2struct ListNode* removeNthFromEnd(struct ListNode* head, int n) {
 3    int count = 0;
 4    struct ListNode * temp = head;
 5    while(temp != NULL){
 6        temp = temp->next;
 7        count++;
 8    }
 9    if (count == 1 && n == 1){
10        return NULL;
11    }
12    count = (count - n);
13    temp = head;
14    while(count != 0){
15        temp = temp->next;
16        count--;
17    }
18    if(temp == head && temp->next != NULL){
19        return temp->next;
20    }
21    struct ListNode * prev_temp = head;
22    while(prev_temp->next != temp){
23        prev_temp = prev_temp->next;
24    } 
25    prev_temp->next = temp->next;
26    return head;
27}