to delete an element.
enter the position of the element to be deleted.
-> pos.

structure of node is 

struct node
{
  int data;
  struct node *prev , *next;
}

//home is the starting pointer of hte list.
struct node * delete(struct node *home , int pos)
{
  temp = home;
  if(pos == 1)
  {
    temp = home;
    home = home -> next;
    free(temp);
  }

  temp = home;
  p = home;
  
   for(i = 0 ; i < pos ; i++)
   {
     p = p -> next;
   }

   temp = p -> next;
  temp1 = temp -> next;

  p -> next = temp1;
  temp1 -> prev = p
  
  free(temp);
}

return home;
}