func IsExtInCert(cert *x509.Certificate, oid asn1.ObjectIdentifier) bool {
	if cert != nil && GetExtFromCert(cert, oid) != nil {
		return true
	}
	return false
}
func IsExtInCert(cert *x509.Certificate, oid asn1.ObjectIdentifier) bool {
	if cert != nil && GetExtFromCert(cert, oid) != nil {
		return true
	}
	return false
}
func IsExtInCert ( cert * x509 . Certificate , oid asn1 . ObjectIdentifier ) bool { if cert != nil && GetExtFromCert ( cert , oid ) != nil { return true } return false }
// IsExtInCert is equivalent to GetExtFromCert() != nil.
IsExtInCert is equivalent to GetExtFromCert () ! = nil .