typedef struct icecream *icecream_ptr;

typedef struct icecream
{
    int height;
    char name[100];
    icecream_ptr left;
    icecream_ptr right;
}icecream;

typedef struct trucks *truck_ptr;

typedef struct trucks
{
    char *n_trucks[20];
    int cont_trucks;
    struct trucks *next,*prev;
}trucks;

void send_truck(icecream_ptr p){

    truck_ptr nova=(truck_ptr)malloc(sizeof(truck));
    nova->prev=NULL;
    nova->next=NULL;
    nova->cont_trucks=0;
    add_to_truck(p,&nova);

void add_to_truck(icecream_ptr p, truck_ptr *imp)
{
    if (p!=NULL)
    {
        add_to_truck(p->left,&(*imp));

        if((*imp)->cont_trucks<20){
        (*imp)->n_names[(*imp)->cont_trucks]=p->name;
        (*imp)->cont_trucks++;
    } else {
        truck_ptr nova=(truck_ptr)malloc(sizeof(truck));
        (*imp)->next=nova;
        nova->prev=(*imp);
        nova->next=NULL;
        nova->cont_trucks=0;
        add_to_truck(p,&nova);
    }

    add_to_truck(p->right,&(*imp));
    }
}