Plugin not working

Hi.
I installed this plugin in site I am using Total Theme but plugin does not executing function. here is code.
/**
Contact form on every posts
*/
function contactform_for_every_post( $content ) {
if ( is_singular(‘post’) ) {
$contactform = ‘[contact-form-7 id=”179″ title=”Help Provide”]’;
echo ‘<h3>I want to provide Help</h3>’;
echo do_shortcode($contactform);
}
}

add_action(‘x_before_the_content_end’, ‘contactform_for_every_post’);