Garage

function solve(input) {
    let garages = {};

    for (const line in input) {
        let [garage, carInfo] = input[line].split(' - ');

        if (!garages.hasOwnProperty(garage)) {
            garages[garage] = {};
        }

        garages[garage][line] = carInfo;
    }

    let entries = Object.entries(garages);

    for (const [garage, carObj] of entries) {
        console.log(`Garage № ${garage}`);

        for (const key in carObj) {
            while (carObj[key].includes(': ')) {
                carObj[key] = carObj[key].replace(': ', ' - ');
            }

            console.log(`--- ${carObj[key]}`);
        }
    }
}
solve(['1 - color: blue, fuel type: diesel',
    '1 - color: red, manufacture: Audi',
    '2 - fuel type: petrol',
    '4 - color: dark blue, fuel type: diesel, manufacture: Fiat'])