C Gift Delivery

function solution() {
    function makeEl(type, text, clazz, id) {
        let el = document.createElement(type);
        if (text !== null) {
            el.textContent = text;
        }
        if (clazz !== null) {
            el.setAttribute('class', clazz);
        }
        if (id !== null) {
            el.setAttribute('id', id);
        }
        return el;
    }

    function removeAndMoveToSection(ul, gift) {
        sections[1].children[1].removeChild(gift);
        gift.lastChild.remove();
        gift.lastChild.remove();
        ul.appendChild(gift);

        let items = [...ul.querySelectorAll('li')];
        ul.innerHTML = '';
        items.sort(((a, b) => a.textContent.localeCompare(b.textContent))).forEach(li => ul.appendChild(li));
    }


    let sections = document.querySelectorAll('section');
    let btn = sections[0].children[1].children[1];
    let input = sections[0].children[1].children[0];


    btn.addEventListener('click', function (e) {

        if (input.value === '') {
            console.log('Error');
            return;
        }
        let giftsList = sections[1].children[1];
        let gift = makeEl('li', input.value, 'gift', null);

        let sendBtn = makeEl('button', 'Send', null, 'sendButton');
        sendBtn.addEventListener('click', function () {
            removeAndMoveToSection(sections[2].children[1], gift);
        });
        gift.appendChild(sendBtn);

        let discardBtn = makeEl('button', 'Discard', null, 'discardButton');
        discardBtn.addEventListener('click', function () {
            removeAndMoveToSection(sections[3].children[1], gift);
        });
        gift.appendChild(discardBtn);

        giftsList.appendChild(gift);
        let items = [...giftsList.querySelectorAll('li')];
        giftsList.innerHTML = '';
        items.sort(((a, b) => a.textContent.localeCompare(b.textContent))).forEach(li => giftsList.appendChild(li));
        input.value = '';
    });
}