How to add shortcode tags in single.php

In my theme has one shortcode tags to display tags of post and function to load content post. But in function doesn’t include shortcode tag. Now I want to add it to function but i don’t know how to do it. Hope everyone help me out. Thank in advance.

Shortcode tag

function wwl_post_tags( $atts ) {
    if( $tags = get_the_tag_list( '', ', ' ) ) {

        $defaults = array(
            'before' => __( 'Từ khóa: ', 'icy' ),
            'after'  => '. ',
        );
        $atts = shortcode_atts( $defaults, $atts );

        return sprintf( '%1$s<span class="entry-tags">%2$s</span>%3$s',
            $atts['before'],
            $tags,
            $atts['after']
        );
    }
}
add_shortcode( 'post_tags', 'wwl_post_tags' );

Function to load content post

function wwl_post_content() {
    global $more;

    if ( ! is_single() ) {
        $more = 0;  
    }

    do_action( 'wwl_before_post_content' ); // Hook

    if ( ! is_single() && of_get_option('post_content') == 2 || is_search() ) :
    ?>
        <div class="entry-summary">
            <?php wwl_thumbnail(); ?>
            <?php the_excerpt(); ?>
            <div class="clearfix"></div>
        </div><!-- .entry-summary -->
    <?php else : ?>
        <div class="entry-content">
            <?php wwl_thumbnail(); ?>
            <?php the_content( '', false, '' ); ?>
            <?php wp_link_pages( array( 'before' => '<div class="page-links">' . __( 'Pages:', 'icy' ), 'after' => '</div>' ) ); ?>         
            <div class="clearfix"></div>
        </div><!-- .entry-content -->
    <?php endif;
}