https://www.sitepoint.com/wordpress-custom-logo-api/
https://developer.wordpress.org/reference/functions/the_custom_logo/
-----
echo the_custom_logo();
$logoimg = wp_get_attachment_image_src( get_theme_mod( 'custom_logo' ), 'full' );
echo var_dump($logoimg);
echo esc_url( $image[0] );
-------------
function.php:
$logoimg = wp_get_attachment_image_src( get_theme_mod( 'custom_logo' ), 'full' );
define( 'LOGOURL', esc_url( $logoimg[0] ) );
--------
<a href="<?php echo site_url()?>" class="logo sticky-logo">
<img src="<?php echo LOGOURL?>" alt="<?php bloginfo('name')?>" />
</a>
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