Google tag manager script in function.php error

Dear support, @NIKKO @rikard
I’ve been trying to implement the Google Tag Code from Google Ads for hours.
But i get every the error:
Uncaught Error: Undefined constant “‘wp_head’” in wp-content/themes/enfold-child/functions.php:24
Stack trace:
#0 wp-settings.php(672): include()
#1 wp-config.php(104): require_once(‘/var/www/vhosts…’)
#2 wp-load.php(50): require_once(‘/var/www/vhosts…’)
#3 wp-admin/admin.php(34): require_once(‘/var/www/vhosts…’)
#4 wp-admin/theme-editor.php(10): require_once(‘/var/www/vhosts…’)
#5 {main}
thrown
What its wrong???

Here is my script
/**
* Google Tag Manager Head Script
*/
function add_custom_gtm(){
?>
<!– Google Tag Manager –>
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({‘gtm.start’:
new Date().getTime(),event:’gtm.js’});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!=’dataLayer’?’&l=’+l:”;j.async=true;j.src=
‘https://www.googletagmanager.com/gtm.js?id=’+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,’script’,’dataLayer’,’GTM-ABCDEFGH’);</script>
<!– End Google Tag Manager –>
<?php
}

add_action(‘wp_head’, ‘add_custom_gtm’);
/**
* Google Tag Manager Body Script
*/
function google_tag_manager_body_code() { ?>
<!– Google Tag Manager (noscript) –>
<noscript><iframe src=”https://www.googletagmanager.com/ns.html?id=GTM-ABCDEFGH&#8221;
height=”0″ width=”0″ style=”display:none;visibility:hidden”></iframe></noscript>
<!– End Google Tag Manager (noscript) –>
<?php }
add_action( ‘ava_after_body_opening_tag’, ‘google_tag_manager_body_code’, 1);

Can anybody help?

Sooo great!