// https://leetcode.com/problems/remove-duplicates-from-sorted-list/


struct ListNode* deleteDuplicates(struct ListNode* head) {
    struct ListNode* headret = head; 
    while (head != NULL && head->next != NULL )
    {
        if(head->val == head->next->val) 
        {
            head->next = head->next->next;
        }
        else
        {
            head = head->next;
        }
    }
    return headret;
}