Enable shortcode in theme

Hi all. I am developing a wordpress theme, but I have a problem: I can’t use shortcodes in my theme. I write:

function display(){
 echo "Something";
}

add_shortcode('code', 'display');

It shows [code] in frontend.
In my theme I am getting pages like this:

<?php
			$mypages = get_pages( array( 'post_type' => 'page') );
			foreach( $mypages as $page ) {
				$content = $page->post_content;
				if ( ! $content )
				$content = qtrans_use($lang, $content );
				?>
				<li id="<?php echo $page->post_name;?>">
					<a href="#!/"> </a>
					<div class="entry"><?php echo $content;?></div>
				</li>
				<?php
			}
		?>

What should I do make my theme support shortcodes.