void append(struct node **p, int item)
 {
 struct node *new, *temp;
 temp = *p;
 if(*p==NULL)
 {
 new = (struct node *) malloc(sizeof(struct node));
 new->data = item;
 new->link = NULL;
 *p = new;
 }
 else
 {
 while (temp->link != NULL)
 temp = temp->link;
 
 new = (struct node *) malloc(sizeof(struct node));
 new->data = item;
 new->link = NULL;
 temp->link = new;
 
 }
 }