more refactor

utils/SavePEMFile.go

@@ -0,0 +1,23 @@
+package utils
+
+import (
+	"encoding/pem"
+	"os"
+)
+
+func SavePEMFile(filename, blockType string, data []byte) error {
+	file, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	err = pem.Encode(file, &pem.Block{
+		Type:  blockType,
+		Bytes: data,
+	})
+	if err != nil {
+		return err
+	}
+	return nil
+}