Untitled

Controllers
  |__ posts
      |__ post.php

views
  |__ welcome_message.php
  |__ home.php

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Welcome to CodeIgniter</title>
</head>
<body>
  <a href="<?php echo site_url("posts/post/posts_controller"); ?>">link</a>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Welcome to CodeIgniter Link Page</title>
</head>
<body>

<div id="container">
    <h1>This is the link page</h1>

<div id="body">
    <p class="footer">Page rendered in <strong>{elapsed_time}</strong> seconds</p>
</div>
</div>

</body>
</html>

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Welcome extends CI_Controller {

       public function __construct()
    {
        parent::__construct();
        $this->load->helper('url');
    }

    public function index()
    {
        $this->load->view('welcome_message');
    }
}

<?php

Class Post extends CI_Controller
{
    public function __construct()
    {
        parent::__construct();
        $this->load->helper('url');
    }

    public function posts_controller()
    {
        $this->load->view('home');
    }

}
?>