function inventory(arr) {
    arr
        .map(line => {
            let [name, level, inventory] = line.split(' / ');
            inventory = inventory.split(', ')
                .sort((a, b) => a.localeCompare(b))
                .join(', ');
            return {
                name,
                level: Number(level),
                inventory
            }
        })
        .sort((a, b) => a.level - b.level)
        .forEach(hero => {
            console.log(`Hero: ${hero.name}`);
            console.log(`level => ${hero.level}`);
            console.log(`items => ${hero.inventory}`)
        })
}