03. Inventory

function inventory(input) {
    let collectedItems = input[0].split(", ");

    for (let i = 1; input[i] !== "Craft!"; i++) {
        [command, item] = input[i].split(" - ");
        if (command === "Collect") {
            if (!collectedItems.includes(item)) {
                collectedItems.push(item);
            }
        } else if (command === "Drop") {
            if (collectedItems.includes(item)) {
                collectedItems.splice(collectedItems.indexOf(item), 1);
            }
        } else if (command === "Combine Items") {
            [oldItem, newItem] = item.split(':');
            if (collectedItems.includes(oldItem)) {
                collectedItems.splice(collectedItems.indexOf(oldItem) + 1, 0, newItem);
            }
        } else {
            if (collectedItems.includes(item)) {
                collectedItems.splice(collectedItems.indexOf(item), 1);
                collectedItems.push(item);
            }
        }
    }

    console.log(collectedItems.join(", "));
    return;
}