Hi, mine was:
<?php if( get_field('personal_website_or_blog_url') ): ?>
<a href="http://<?php $site = get_field('personal_website_or_blog_url');
$site = str_replace(array('http://', 'https://'), '', $site);
$site = rtrim($site, '/');
echo $site;?>" data-avia-related-tooltip="view website" target="_blank">
<i class="fa fa-television" title="Personal Website" aria-hidden="true"></i></a>
<?php endif; ?>
… obviously my field was ‘personal_website_or_blog_url’ so you would need to change that out for yours.