Custom Comment Display

I am trying to call a custom callback function to wp_list_comments.

    @php
      wp_list_comments( array (
          'style' => 'ul',
          'short_ping' => true,
          'callback' => 'mytheme_comment'
      ));
    @endphp

But I receive the following alert message.

( ! ) Warning: call_user_func() expects parameter 1 to be a valid callback, function ‘mytheme_comment’ not found or invalid function name in /srv/www/example.com/current/web/wp/wp-includes/class-walker-comment.php on line 179

I am trying to replicate the same as wordpress does in the following example.

https://codex.wordpress.org/Function_Reference/wp_list_comments

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