typedef struct List{
  struct List *next;  
  int val;
}* Liste;

Liste delete(Liste entry)
{
  Liste elem;
  if(entry!=NULL){
    elem=entry->next;
    if(elem==entry)
      {
	free(elem);
	entry=NULL;
      }
    else
      {
	while(elem->next!=entry)
	  {
	    elem=elem->next;
	  }
	elem->next=entry->next;
	free(entry);
	entry=elem;
      }
  }
  return entry;
}