Adding a random string as slug f?r CPT

Hi!

I’m trying to add a random string as slug for a CPT. I’m not a programmer so my solution after googling a lot is to first add a new custom field called cv_random_string and creating a random string that i fill it with. Then I use the value of that field and use it as slug. This works fine when creating the post. But when I update the post the random string is added once again to the slug. This only happens once. https://www.mysite.com/cv/v6ji4puptusr becomes https://www.mysite.com/cv/v6ji4puptusr-v6ji4puptusr/.

I would like it to only have the random string appended to the slug once. Also, maybe it’s possible to not use my two step solution with the random string field? ??

What I want is basically to add a random string as slug in the CPT cv.

This is the code I use:

/** Generate random string */
function wpwebguider_random_string( $length = 12 ) {
    $str = "";
	$characters = array_merge(range('0', '9'), range('a', 'z'), range('A', 'Z'));
//    $characters = range('A','Z');
    $max = count($characters) - 1;
    for ($i = 0; $i < $length; $i++) {
        $rand = mt_rand(0, $max);
        $str .= $characters[$rand];
    }
    return $str;
}
/** Set Dynamically ACF Field Default Value */
add_filter('acf/load_field/name=cv_random_string', 'wpwebguider_acf_load_random_string_value', 99, 1);
function wpwebguider_acf_load_random_string_value( $field ) {
    $random_code = wpwebguider_random_string();        
    if( $random_code ) {
        $field['default_value'] = $random_code; 

    }   
    return $field;
}




/** Add random string as slug, this doesn't work */
function acf_title_companies( $value, $post_id, $field ) {

	if ( get_post_type( $post_id ) == 'cv' ) {

		$new_title = get_field( 'cv_random_string', $post_id ) . ' ' . $value;
		
		
		
		
		wp_update_post( array(
			'ID'         => $post_id,
			'post_name'  => $new_title,
			)
		);
	}

	return $value;
} 
add_filter( 'acf/update_value/name=cv_random_string', 'acf_title_companies', 10, 3 );