4.Fill dropdown

function solve() {
    let selectMenu = document.getElementById('menu');
    let addBtn = document.querySelector('form input[type="submit"]');
    addBtn.addEventListener('click', function (e) {
        e.preventDefault();
        addOption();
    });

    function addOption() {
        let currentValue = document.getElementById('newItemValue').value;
        let currentText =  document.getElementById('newItemText').value;

        let newOption = document.createElement('option');
        newOption.value = currentValue;
        newOption.textContent = currentText;
        selectMenu.appendChild(newOption);

        document.getElementById('newItemValue').value = '';
        document.getElementById('newItemText').value = '';
    }
}