help to remove last trailing slash using add_rewrite_rule

Question

I already tried in several ways to remove the last slash of the url that I created with add_rewrite_rule.

below is the implementation of my code

function master_load_ads_txt_template_include($template) {
  $is_load_ads_txt = (bool)get_query_var('ads-txt');
  if( $is_load_ads_txt ) {
    $template = get_template_part("template-parts/ads-txt");
  }

  return $template;
}
add_action( 'template_include', 'master_load_ads_txt_template_include' );

function master_load_ads_txt_rewrite() {
  add_rewrite_rule('ads.txt', 'index.php?ads-txt=true', 'top');
  add_rewrite_rule('^ads.txt/', 'ads.txt', 'top');
}
add_action('init', 'master_load_ads_txt_rewrite');

function master_load_ads_txt_query_vars( $query_vars ) {
  $query_vars[] = 'ads-txt';
  return $query_vars;
}
add_filter( 'query_vars', 'master_load_ads_txt_query_vars');

the code is working but does not remove the slash at the end of the url

Answer 1

/* ORIGINAL CODE */
function master_load_ads_txt_template_include($template) {
    $is_load_ads_txt = (bool)get_query_var('ads-txt');
    if( $is_load_ads_txt ) {
        $template = get_template_part("template-parts/ads-txt");
    }
    return $template;
}
add_action( 'template_include', 'master_load_ads_txt_template_include' );

function master_load_ads_txt_rewrite() {
    /* UPDATE RULE */
    add_rewrite_rule('^ads.txt$', 'index.php?ads-txt=true', 'top');
}
add_action('init', 'master_load_ads_txt_rewrite');

function master_load_ads_txt_query_vars( $query_vars ) {
    $query_vars[] = 'ads-txt';
    return $query_vars;
}
add_filter( 'query_vars', 'master_load_ads_txt_query_vars');

/* ACTION TO ALLOW URL WITHOUT LAST TRAILING SLASH */
function disable_canonical_redirects_for_ads_txt( $redirect_url, $requested_url ) {
    if ( preg_match( '|ads\.txt|', $requested_url ) ) {
        return $requested_url;
    }
    return $redirect_url;
}
add_action( 'redirect_canonical', 'disable_canonical_redirects_for_ads_txt', 10, 2 );