void add(list *pl, unsigned pos, int element)
{
        if(pl == NULL) return;
        list l = *pl;
        list temp;
        unsigned i = 1;
        temp=(list)malloc(sizeof(list));
        temp->content = element;
        temp->succ=NULL;
        if(l==NULL || pos=0)
        {
            *pl=temp;
            temp->succ=l;
            l=temp;
            return;
        }