#442 Counting Items by Order City

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Themes:

JavaStreams & LambdasPractice

Fill itemsCountByCity by counting the number of items for each city:

@Value
public class Order<T> {
    Integer id;
    String city;
}

@Value
public class Item {
    Integer id;
    Integer orderId;
}

List<Order> orders;
List<Item> items;

Map<String, Integer> itemsCountByCity;

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