code: private function prepareAcls($blockedAcls)
      {
          $result = '';
  
          if ($blockedAcls != null) {
              $blockedAclsPieces = explode(",", $blockedAcls);
              foreach ($blockedAclsPieces as $acl) {
                  $result .= ' req.http.Fastly-Client-Ip ~ ' . $acl . ' ||';
              }
          }
  
          return $result;
      }
docs: Prepares ACL VCL snippets
  
  @param $blockedAcls
  @return string