Drupal Form issues

<?php
function salesforceconnection(){	
define("USERNAME", "USERNAME");
define("PASSWORD", "PASSWORD");
define("SECURITY_TOKEN", "PASSWORD TOKEN");
require_once ('soapclient/SforcePartnerClient.php');

$mySforceConnection = new SforcePartnerClient();
$mySforceConnection->createConnection("soapclient/partner.wsdl.xml");
$mySforceConnection->login(USERNAME, PASSWORD.SECURITY_TOKEN);

$query = "SELECT Name FROM TREK__c";
$result = $mySforceConnection->query($query);
	
$result2[] = $result ; 		

return $result; 
}
	
function formtest_menu() {
  $items = array();
  $items['form'] = array(
    'title' => t('TREK validation'),
    'page callback' => 'formtest_form',
    'access arguments' => array('access content'),
    'description' => t('My form'),
    'type' => MENU_CALLBACK,
  );
  return $items;
}

function formtest_form() {
  return drupal_get_form('formtest_my_form');
}

function formtest_my_form($form_state) {
 
  $form['serial'] = array(
    '#type' => 'textfield',
    '#title' => t('TREK'),
    '#required' => TRUE,
    '#description' => "Please enter your TREK serial in the format: XXX-XXX-XXX-XXX",
  );
    
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => 'Submit',
  );
  return $form;
}

function formtest_my_form_submit($form, &$form_state){

$serial = $form_state['input']['serial'];	

function formtest_my_form_execute($form, $form_state){
	foreach($result as $record){
		
	$id[] = $record->Name ;
		 
	}
	


	if(in_array($serial, $id))
	{
		drupal_set_message("Valid Serial number &#8230; Download will start");
	}
	else
	{
			drupal_set_message("This is not a valid serial number, please try again");
	}

}