Remove unused functions such as `print` and use `error` function

[BaseMax]

Remove unused functions such as print and use error function

function print(text) {
    outputElm.innerHTML = text.replace(/\n/g, '<br>');
}

function error(e) {
    console.log(e);
    errorElm.style.display = 'block';
    errorElm.textContent = e.message;
}