SinglyLinkedListNode* insertNodeAtTail(SinglyLinkedListNode* head, int data) {

    SinglyLinkedListNode *new_node,*ptr;
    new_node = new SinglyLinkedListNode();
    new_node->data = data;
    new_node->next = NULL;
    if(head == NULL){
        head = new_node;
        return head;
    }else{
        ptr = head;
        while(ptr != NULL){
            ptr = ptr->next;
        }
        ptr->next = new_node;
        new_node->next = NULL;
return head;    
    }

}

can you please help me with this code?