wpautop on section

by

Please try this

$c = get_the_content();

instead of:

$c = the_content();

since the_content() will echo the content instead of returning it.

Or try this

<section class="post-content clearfix" itemprop="articleBody">
    <?php  add_filter( 'the_content', 'wpautop' ); ?>
    <?php the_content(); ?>
    <?php  remove_filter( 'the_content', 'wpautop' ); ?>
</section>