Refactor cert.go to remove unused certificate-related methods

cert.go

@@ -255,33 +255,3 @@ func (cm *certManager) displayCertInfoKeyPoints() [][2]string {
 
 	return result
 }
-
-// getCertORG returns the organization name from the certificate.
-// The organization name is typically included in the certificate's subject field.
-func (cm *certManager) getCertORG() string {
-	return cm.certORG
-}
-
-// getCertSERIAL returns the serial number from the certificate.
-// The serial number is a unique identifier assigned by the certificate issuer.
-func (cm *certManager) getCertSERIAL() string {
-	return cm.certSERIAL
-}
-
-// isExpired returns whether the certificate is expired.
-// This indicates if the certificate's validity period has ended.
-func (cm *certManager) isExpired() bool {
-	return cm.expired
-}
-
-// isExpiringSoon returns whether the certificate is expiring soon.
-// This indicates if the certificate is approaching its expiration date.
-func (cm *certManager) isExpiringSoon() bool {
-	return cm.expire_soon
-}
-
-// daysUntilExpire returns the number of days until the certificate expires.
-// This provides a countdown of days remaining before the certificate becomes invalid.
-func (cm *certManager) daysUntilExpire() uint16 {
-	return cm.expire_days
-}