generate method
Generates an item of type T
Implementation
@override
Goods generate() {
final generator = ListItemGenerator(_pool.keys.toList());
generator.seed(_seed);
final name = generator.generate();
final cost = double.parse(_pool[name]!.split(" ").first);
final coins = _pool[name]!.split(" ").last;
return Goods(name: name, price: "${_getCost(cost)} $coins");
}