pub fn fn_cert_extensions_append(
extensions: &Vec<CertificateExtension>,
extension: &CertificateExtension,
) -> Result<Vec<CertificateExtension>, FnError>pub fn fn_cert_extensions_append(
extensions: &Vec<CertificateExtension>,
extension: &CertificateExtension,
) -> Result<Vec<CertificateExtension>, FnError>