soldier* create_reverse_circle(int n){
    soldier *head;
    soldier *tmp;
    for(int i=0;n>i;n--){
        if(start==NULL){
            head = create_soldier(n);
            head->next = head->prev = head;
            start=head;
			tmp=head;
        }
        else{
            tmp->next=create_soldier(n);
			tmp = tmp->next;
            tmp->next = root;
        }
    }
    return head;
}