pub fn fn_append_certificate_entries(
certs: &Vec<CertificateEntry>,
cert_entry: &CertificateEntry,
) -> Result<Vec<CertificateEntry>, FnError>pub fn fn_append_certificate_entries(
certs: &Vec<CertificateEntry>,
cert_entry: &CertificateEntry,
) -> Result<Vec<CertificateEntry>, FnError>