WP Template customizing - wordpress

Question

i'm trying to change my single-post template ,But i can't the the_content Function.
Where should it be ?
<div class="single-post-content clearfix">
<?php
the_content(esc_html__('Read more!', 'voyager'));
wp_link_pages(array('before' => '<div class="page-link">' . esc_html__('Pages', 'voyager') . ': ', 'after' => '</div>'));
?>
</div>
Update 1 the entire code
<?php
/**
* The template for displaying all single posts and attachments
*/
get_header();
$pf = get_post_format();
$voyager_single_post_sidebar_under = cstheme_option( 'single_post_sidebar_under' );
$single_post_sidebar = cstheme_option( 'single_post_sidebar' );
$single_post_sidebar_position = '';
if( $single_post_sidebar == 'left-sidebar' ) {
$single_post_sidebar_position = 'pull-right';
}
/* ADD 1 view for this post */
$post_views = (get_post_meta(get_the_ID(), "post_views", true) > 0 ? get_post_meta(get_the_ID(), "post_views", true) : "0");
update_post_meta(get_the_ID(), "post_views", (int)$post_views + 1);
$single_post_featured_img = cstheme_option( 'single_post_featured_img' );
$featured_image_url = wp_get_attachment_url(get_post_thumbnail_id());
?>
<div class="container">
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<div id="blog-single-wrap" class="<?php echo 'format-' . $pf . ' featured_img_' . $single_post_featured_img ?> clearfix">
<?php if( isset( $single_post_featured_img ) && $single_post_featured_img == 'fullwidth' ) { ?>
<div class="single_post_header">
<div class="featured_img_bg" style="background-image:url(<?php echo $featured_image_url; ?>);"></div>
<div class="single_post_meta_category"><?php the_category(', '); ?></div>
<h2 class="single-post-title"><?php the_title(); ?></h2>
<div class="single_post_header_bottom">
<div class="single_post_meta">
<span class="post-meta-date"><?php the_time('M j, Y') ?></span>
<span class="post_meta_views"><i class="fa fa-eye"></i> <span><?php echo (get_post_meta(get_the_ID(), "post_views", true) > 0 ? get_post_meta(get_the_ID(), "post_views", true) : "0"); ?></span></span>
<span class="post-meta-likes"><?php echo cstheme_likes(); ?></span>
<span class="post-meta-comments"><i class="fa fa-comments"></i><?php echo get_comments_number(get_the_ID()); ?></span>
</div>
</div>
</div>
<?php if ( $single_post_sidebar != 'no-sidebar' && $voyager_single_post_sidebar_under != 'next' && ( $pf != 'image' && $pf != 'standard' ) ) { ?>
<div class="post_format_content mb55 text-center">
<?php get_template_part( 'framework/post-format/post', get_post_format() ); ?>
</div>
<?php } ?>
<?php } else { ?>
<div class="single_post_header">
<div class="single_post_meta_category"><?php the_category(', '); ?></div>
<h2 class="single-post-title"><?php the_title(); ?></h2>
<div class="row single_post_header_bottom">
<div class="col-md-4 text-left">
<div class="single_post_meta_author"><?php echo esc_html__('posted by', 'voyager') ?> <a class="heading_font" href="<?php echo esc_url( get_author_posts_url(get_the_author_meta('ID')) ); ?>"><?php echo get_the_author_meta('display_name') ?></a></div>
</div>
<div class="col-md-4">
<div class="single_post_meta">
<span class="post-meta-date"><?php the_time('M j, Y') ?></span>
<span class="post_meta_views"><i class="fa fa-eye"></i> <span><?php echo (get_post_meta(get_the_ID(), "post_views", true) > 0 ? get_post_meta(get_the_ID(), "post_views", true) : "0"); ?></span></span>
<span class="post-meta-likes"><?php echo cstheme_likes(); ?></span>
<span class="post-meta-comments"><i class="fa fa-comments"></i><?php echo get_comments_number(get_the_ID()); ?></span>
</div>
</div>
<div class="col-md-4 text-right">
<?php if(cstheme_option('single_post_sharebox') != 0) { get_template_part( 'templates/blog/sharebox' ); } ?>
</div>
</div>
</div>
<?php if ( $voyager_single_post_sidebar_under != 'next' ) { ?>
<div class="post_format_content mb55 text-center">
<?php get_template_part( 'framework/post-format/post', get_post_format() ); ?>
</div>
<?php } ?>
<?php } ?>
<?php if( $single_post_sidebar != 'no-sidebar' ) { ?>
<div class="row">
<div class="col-md-9 <?php echo $single_post_sidebar_position; ?>">
<?php } ?>
<?php if( isset( $single_post_featured_img ) && ( $single_post_featured_img == 'fullwidth' ) && ( $pf != 'image' && $pf != 'standard' ) && $voyager_single_post_sidebar_under != 'under' ) { ?>
<div class="post_format_content mb55 text-center">
<?php get_template_part( 'framework/post-format/post', $pf ); ?>
</div>
<?php } else if ( $single_post_featured_img != 'fullwidth' && $voyager_single_post_sidebar_under != 'under' ) { ?>
<div class="post_format_content mb55 text-center">
<?php get_template_part( 'framework/post-format/post', get_post_format() ); ?>
</div>
<?php } ?>
<div class="single-post-content clearfix">
<?php
the_content(esc_html__('Read more!', 'voyager'));
wp_link_pages(array('before' => '<div class="page-link">' . esc_html__('Pages', 'voyager') . ': ', 'after' => '</div>'));
?>
</div>
<div class="posts_nav_link"><?php posts_nav_link(); ?></div>
<div class="single_sharebox_wrap clearfix">
<div class="single_post_meta_tags pull-left">
<?php if( has_tag() ) {
the_tags('','', '');
} ?>
</div>
<div class="pull-right">
<?php if(cstheme_option('single_post_sharebox') != 0) { get_template_part( 'templates/blog/sharebox' ); } ?>
</div>
</div>
<?php if(cstheme_option('single_post_authorinfo') != 0) { get_template_part( 'templates/blog/authorinfo' ); } ?>
<?php if(cstheme_option('single_post_navigation') != 0) { ?>
<div class="single_post_nav clearfix">
<?php
$prev_post = get_adjacent_post(false, '', true);
$next_post = get_adjacent_post(false, '', false);
if($prev_post){
$post_url = get_permalink($prev_post->ID);
echo '<div class="pull-left"><p class="heading_font"><i class="fa fa-chevron-left"></i>' . esc_html__('Previous','voyager') . '</p><b>' . $prev_post->post_title . '</b></div>';
}
if($next_post) {
$post_url = get_permalink($next_post->ID);
echo '<div class="pull-right text-right"><p class="heading_font">' . esc_html__('Next','voyager') . '<i class="fa fa-chevron-right"></i></p><b>' . $next_post->post_title . '</b></div>';
}
?>
</div>
<?php } ?>
<?php if( $single_post_sidebar != 'no-sidebar' ) { ?>
</div>
<div class="col-md-3">
<?php get_sidebar(); ?>
</div>
</div>
<?php } ?>
<?php if(cstheme_option('single_post_relatedposts') != 0) { get_template_part('templates/blog/related-posts'); } ?>
<?php
if ( comments_open() || get_comments_number() ) :
comments_template();
endif;
?>
</div>
<?php endwhile; endif; ?>
</div>
<?php get_footer(); ?>
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