Changing Site Logo URL Through Child Theme

I’m newish to WordPress, brand-new at child themes, and don’t know PHP at all, so I hope I’m even asking the right questions here!

Using my child theme for the Oxygen Theme, I want to change the site logo’s url so it points to an external website. Before I was working in a child theme, I was able to achieve this by directly editing the functions.php file (I know, I know… not supposed to do that!); here’s the code:

‘function oxygen_site_title() {

$tag = ( is_front_page() ) ? ‘h1’ : ‘div’;

if ( get_header_image() ) {

echo ‘<‘ . $tag . ‘ id=”site-title”>’ . “\n”;
echo ‘‘ . “\n”;
echo ‘<img class=”logo” src=”‘ . get_header_image() . ‘” alt=”‘ . get_bloginfo( ‘name’ ) . ‘” />’ . “\n”;
echo ‘‘ . “\n”;
echo ‘</’ . $tag . ‘>’ . “\n”;’

When I replaced “get_home_url” with the URL I wanted, it worked fine. However, when I try to put this in my Child Theme in a functions.php file with the URL changed, it doesn’t work.

Any suggestions would be greatly appreciated! Thanks in advance for any help!