func = () => {
  const ing = {
    protein: 0,
    carbohydrate: 0,
    fat: 0,
    flavour: 0,
  };

  const recipes = {
    apple: { carbohydrate: 1, flavour: 2 },
    lemonade: { carbohydrate: 10, flavour: 20 },
    burger: { carbohydrate: 5, fat: 7, flavour: 3 },
    turkey: { protein: 10, carbohydrate: 10, fat: 10, flavour: 10 },
    eggs: { protein: 5, fat: 1, flavour: 1 },
  };

  commands = {
    restock: (x, y) => {
      ing[x] += Number(y);
      return 'Success';
    },

    prepare: (x, y) => {
      let result = 'Success';
      let success = true;
      recipe = Object.entries(recipes[x]);

      for (let elem of recipe) {
        if (ing[elem[0]] < elem[1] * y) {
          success = false;
          result = `Error: not enough ${elem[0]} in stock`;
          break;
        }
      }

      if (success) {
        recipe.forEach(e => (ing[e[0]] -= e[1] * y));
      }
      return result;
    },

    report: () =>
      Object.entries(ing)
        .map(e => `${e[0]}=${e[1]}`)
        .join(' '),
  };

  return x => {
    const [command, element, quantity] = x.split(' ');
    return commands[command](element, quantity);
  };
}