Can't summarize; no "post_content()"

Hello folks,

I’m having trouble creating a summary of the post that appears instead of the full post. I’ve done some research and other users have resolved this by changing “the_content()” to “the_excerpt()” in the index.php file.

The problem is that my index.php does not have “the_content()” anywhere! Am I looking in the wrong spot? I’m using Godaddy’s built-in WordPress capability and using the “Sparkling” theme. The whole of the index.php code is short, so I’ve pasted it below…
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<?php
/**
* The main template file.
*
* This is the most generic template file in a WordPress theme
* and one of the two required files for a theme (the other being style.css).
* It is used to display a page when nothing more specific matches a query.
* E.g., it puts together the home page when no home.php file exists.
* Learn more: https://codex.www.ads-software.com/Template_Hierarchy
*
* @package sparkling
*/

get_header(); ?>

<div id=”primary” class=”content-area”>
<main id=”main” class=”site-main” role=”main”>

<?php if ( have_posts() ) : ?>

<?php /* Start the Loop */ ?>
<?php while ( have_posts() ) : the_post(); ?>

<?php
/* Include the Post-Format-specific template for the content.
* If you want to override this in a child theme, then include a file
* called content-___.php (where ___ is the Post Format name) and that will be used instead.
*/
get_template_part( ‘content’, get_post_format() );
?>

<?php endwhile; ?>

<?php sparkling_paging_nav(); ?>

<?php else : ?>

<?php get_template_part( ‘content’, ‘none’ ); ?>

<?php endif; ?>

</main><!– #main –>
</div><!– #primary –>

<?php get_sidebar(); ?>
<?php get_footer(); ?>