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let msg = '';
for (let i = 0; i < document.getElementsByClassName('books')[0].getElementsByClassName('list-group list-group-flush')[0].getElementsByClassName('library-item-info').length; i++) {
let name = document.getElementsByClassName('books')[0].getElementsByClassName('list-group list-group-flush')[0].getElementsByClassName('library-item-info')[i].getElementsByClassName('title')[0].innerText;
let author = document.getElementsByClassName('books')[0].getElementsByClassName('list-group list-group-flush')[0].getElementsByClassName('library-item-info')[i].getElementsByClassName('author')[0].innerText;
msg += name + '\t' + author + '\n';

}
console.log(msg)