function solution() {
    const products = {
        protein: 0,
        carbohydrate: 0,
        fat: 0,
        flavour: 0
    }
    const meals = {
        apple: { carbohydrate: 1, flavour: 2 },
        lemonade: { carbohydrate: 10, flavour: 20 },
        burger: { carbohydrate: 5, fat: 7, flavour: 3 },
        eggs: { protein: 5, fat: 1, flavour: 1 },
        turkey: { protein: 10, carbohydrate: 10, fat: 10, flavour: 10 }
    }

    return function action (str) {
        let array=str.split(' ');
        let toDo = array[0];

        if (toDo === 'restock') {
            let product = array[1];
            let quantity = Number(array[2]);
            products[product] += quantity;
            return 'Success';
        } else if (toDo === 'prepare') {
            let meal = array[1];
            let quantity = Number(array[2]);
            for (let ingredient in meals[meal]) {
                const neededQuantity = meals[meal][ingredient] * quantity;
                if (neededQuantity > products[ingredient]) {
                    return `Error: not enough ${ingredient} in stock`;
                } else {
                    const neededQuantity = meals[meal][ingredient] * quantity;
                    products[ingredient] -= neededQuantity;
                    return 'Success';
                }
            }
        } else if (toDo === 'report') {
            return `protein=${products.protein} carbohydrate=${products.carbohydrate} fat=${products.fat} flavour=${products.flavour}`;
        }
    }
}
let rob = solution();
console.log(rob ('restock flavour 50'));
console.log(rob ('report'))