Editing functions.php to use my theme wrappers for WooCommerce

Hi,

I am trying to edit functions.php per these instructions and I need some help in getting the syntax correct for adding these lines.

add_action('woocommerce_before_main_content', 'my_theme_wrapper_start', 10);
add_action('woocommerce_after_main_content', 'my_theme_wrapper_end', 10);

function my_theme_wrapper_start() {
  echo '<section id="main">';
}

function my_theme_wrapper_end() {
  echo '</section>';
}

The code from page.php is:

<?php
get_template_part('single', 'config');
get_header();
global $blogConf, $show, $single_content_type, $data, $isFrontendEditorPage, $isProfileOptionsPage, $isFavoritePage, $isDraftPage;
if (have_posts ()) { the_post();
    $isFrontendEditorPage=isset($data['frontend_editor_page'])&&$data['frontend_editor_page']==$post->ID ? true:false;
    $isProfileOptionsPage=isset($data['profile_options_page'])&&$data['profile_options_page']==$post->ID ? true:false;
    $isFavoritePage      =isset($data['favorite_page'])       &&$data['favorite_page']       ==$post->ID ? true:false;
	$isDraftPage      =isset($data['draft_page'])       &&$data['draft_page']       ==$post->ID ? true:false;
    $single_content_type=array('item','teaser');
    if($isFavoritePage || $isDraftPage){get_template_part('frontend','favorite');}
    else{get_template_part('content', 'single');}
}
get_footer();

And from single.php is:

<?php
get_template_part('single', 'config');
get_header();
global $blogConf, $single_content_type;
if (have_posts ()) { the_post();
    $single_content_type=array('item','meta');
    $format = get_post_format();
    $formatimg = $format == '' ? 'standart' : "format-$format";
    get_template_part('content', 'single');
}
get_footer(); ?>

Many thanks in advance!