void do_work_a_depot_command(Model& model,int id1,int id2){
Person *p = model.get_Person_ptr(id1);
Oxygen_Depot *o = model.get_Oxygen_Depot_ptr(id2);
bool null=!(o!=0 && p!=0);
if(p->get_state()!='x' && !null){
    p->start_supplying(o);
}else if(!null){
    std::cout << "I can't move, I'm dead.n";
}

return;