#249 Grouping Cars by Brand

Companies:

GosUslugi

Themes:

JavaStreams & LambdasPractice

Write a toBrandMap method that returns a map where car brands are used as keys and models are stored as values:

class Car {
    String brand;
    String model;
}

Map<String, List<Car>> toBrandMap(List<Car> cars) {
    return // your code
}

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