twenty_twenty_one_nav_menu_social_icons( string $item_output, WP_Post $item, int $depth, stdClass $args ): string

68function twenty_twenty_one_nav_menu_social_icons( $item_output, $item, $depth, $args ) {69	// Change SVG icon inside social links menu if there is supported URL.70	if ( 'footer' === $args->theme_location ) {71		$svg = twenty_twenty_one_get_social_link_svg( $item->url, 24 );72		if ( ! empty( $svg ) ) {73			$item_output = str_replace( $args->link_before, $svg, $item_output );74		}75	}76 77	return $item_output;78}