Add custom column for custom field

I adjusted the code for you. You can directly use the code in functions.php file. Here is more reference that can help you to understand more.
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// Adding Custom Column
add_filter('manage_stfic_posts_columns', 'ST4_columns_head_only_stfic', 10);
add_action('manage_stfic_posts_custom_column', 'ST4_columns_content_only_stfic', 10, 2);

// CREATE TWO FUNCTIONS TO HANDLE THE COLUMN
function ST4_columns_head_only_stfic($defaults) {
    $defaults['bookcode'] = 'Book Code';
    return $defaults;
}
function ST4_columns_content_only_stfic($column_name, $post_ID) {
    if ($column_name == 'bookcode') {

        // Now you have to garb the meta value and show.            
        $book_code = get_post_meta($post_ID,'bookcode',true);
        echo '<span>'.$book_code.'</span>';
    }
}