how to call my register custom post type function in my main plugin file

Hello Guys,

Can you help me on how can I solved this.
I have 3 files:
wp_hotel.php – main plugin file
wp_hotel-admin.php – for creating admin menus in wordpress dashboard
wp_hotel-post-type.php -for creating the custom post type

now the code to call my 2 file in my wp_hotel.php is

add_action('admin_menu', array('CPHotel_Admin', 'admin_menu'));
add_action('admin_init', array('CPHotel_PostType', 'custom_post_type'));

Creating the admin menus in the dashboard works fine, but creating the post type doesn’t work

the custom_post_type() function in my CPHotel_PostType class in wp_hotel-post-type.php is this:

public static function custom_post_type(){
  add_action('init','register_hotel_post_type');
  add_action('init','register_hotel_metabox');
  add_action('init','register_hotel_taxonomy');
}

my codes in register_hotel_post_type

public function register_hotel_post_type(){
   $args = array(
   'labels' => array(
   'name' => 'Hotel Rooms',
   'singular_name' => 'Hotel Room',
   'add_new' => 'Add New Hotel Room',
   'add_new_item' => 'Add New Hotel Room',
   'edit_item' => 'Edit Hotel Room',
   'new_item' => 'Add New Hotel Room',
   'view_item' => 'View Hotel Room',
   'search_items' => 'Search Hotel Rooms',
   'not_found' => 'No Hotel Rooms Found',
   'not_found_in_trash' => 'No Hotel Rooms Found in Trash'),
   'query_var' => 'cphotelroom',
   'rewrite' => array('slug' => 'cphotelroom/',),
   'public' => true,
   menu_icon' => plugins_url('wp_customhotelbooking/assets/img/home16.png', __FILE__),
   'supports' => array('title','thumbnail','editor','excerpt','page-attributes',));
   register_post_type('cphotelroom',$args);
}

How can I Fixed this….please help…