two form in one page drupal

custom_two_form.module

<?php

/**
 * Implements hook_menu().
 */
function custom_two_form_menu() {
  $items = array();
  
  $items['custom'] = array(
    'title' => 'Custom',
    'description' => 'Two forms one page',
    'page callback' => 'custom_two_form',
    'access arguments' => array('access content'),
  );
  
  return $items;
}

/**
 * View form.
 */
function custom_two_form() {
  $output = '';
  
  $form_one = drupal_get_form('first_form');
  $output .= drupal_render($form_one);
  
  $form_two = drupal_get_form('second_form');
  $output .= drupal_render($form_two);
  
  return $output;
}

/**
 * First form.
 */
function first_form($form, &$form_state) {
  $form = array();
  
  ...
  
  return $form;
}

/**
 * Second form.
 */
function second_form($form, &$form_state) {
  $form = array();
  
  ...
  
  return $form;
}