docs: public static void saveX509Cert( Certificate[] certs, File certFile ) throws GeneralSecurityException, IOException
      {
          try ( BufferedWriter writer = new BufferedWriter( new FileWriter( certFile ) ) )
          {
              for ( Certificate cert : certs )
              {
                  String certStr = Base64.getEncoder().encodeToString( cert.getEncoded() ).replaceAll( "(.{64})", "$1\n" );
  
                  writer.write( BEGIN_CERT );
                  writer.newLine();
  
                  writer.write( certStr );
                  writer.newLine();
  
                  writer.write( END_CERT );
                  writer.newLine();
              }
          }
      }