How to Create a Contact Form In CodeIgniter

Contact.php

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

class Contact extends CI_Controller {

    /**
     * Index Page for this controller.
     *
     * Maps to the following URL
     * 		http://example.com/index.php/welcome
     *	- or -
     * 		http://example.com/index.php/welcome/index
     *	- or -
     * Since this controller is set as the default controller in
     * config/routes.php, it's displayed at http://example.com/
     *
     * So any other public methods not prefixed with an underscore will
     * map to /index.php/welcome/<method_name>
     * @see https://codeigniter.com/user_guide/general/urls.html
     */
    public function index()
    {
        //Loading the form validation library
        $this->load->library(array('form_validation','session'));

        $this->form_validation->set_rules('firstname', 'Firstname', 'required');
        $this->form_validation->set_rules('lastname', 'Lastname', 'required');
        $this->form_validation->set_rules('email', 'Email', 'required');
        $this->form_validation->set_rules('telephone', 'Telephone', 'required');
        $this->form_validation->set_rules('comment', 'Comment', 'required');


        if ($this->form_validation->run() == TRUE) {
            $this->load->library('email');
            $this->email->from('[email protected]', 'John Doe');
            $this->email->to('[email protected]');
            $this->email->cc('[email protected]');

            $this->email->subject('Contact Form');


            $message = 'Name:'.$this->input->post("firstname");
            $message .= "<br>";
            $message .= 'Email:'.$this->input->post("email");
            $message .= "<br>";
            $message .= 'Comment:'.$this->input->post("comment");



            $this->email->message($message);
            $this->email->send();
            $this->session->set_flashdata('msg', 'Your Contact request sent!');
        }
        $this->load->view('contact');
    }
}