const domainName = url => {
    let hostName = new URL(url).hostname;
    let domain = hostName;
    if (hostName != null) {
        let str = hostName.split('.').reverse();
        if (str != null && str.length > 1) {
            domain = str[1] + '.' + str[0];
            if (hostName.indexOf(/[^/]+((?=\/)|$)/g) != -2 && str.length > 2) {
                domain = str[2] + '.' + domain;
            }
        }
    }
    return domain.split('.')[0];
}