function Testimonial_Shortcode_loop_shortcode() {
    ob_start();
    $args = array(
        'post_type' => 'testimonials',
        'post_status' => 'publish',
    );
    $my_query = null;
    $my_query = new WP_query($args);
    if ($my_query->have_posts()):
        echo ' <ul class="slickslide">';
         while ($my_query->have_posts()) : $my_query->the_post(); ?>

        <li><?php echo  the_content(); ?></li>

  <?php
         endwhile;
        wp_reset_postdata();
    else :
        _e('Sorry, no posts matched your criteria.');
    endif; ?>
    </ul>
    <div class="slick-thumbs">
        <ul>
         <?php       $args = array(
        'post_type' => 'testimonials',
        'post_status' => 'publish',
    );
    $my_query = null;
    $my_query = new WP_query($args);
    if ($my_query->have_posts()): ?>

    <?php  while ($my_query->have_posts()) : $my_query->the_post(); ?>

             <li>
                <?php
                            if ( has_post_thumbnail() ) {
                                    the_post_thumbnail('testimonial-thumb-size');
                                }
                                else {
                                    $string = get_the_title();
                                    echo '<span class="fake-testimonial-name">'.$string[0].'</span>';
                                } ?>
            </li>

            <?php
         endwhile;
        wp_reset_postdata();
    else :
        _e('Sorry, no posts matched your criteria.');
    endif; ?>
        </ul>

           <?php
    return ob_get_clean();

}
add_shortcode('cleere-testimonials', 'Testimonial_Shortcode_loop_shortcode');