How to write secret object fetched from Goclient for kubernetes

Question

I have

func (ss *K8sService) GetSecret(k8sclient kubernetes.Interface, namespace, secretName string) (secret *corev1.Secret, err error) {
        secret, err = k8sclient.CoreV1().Secrets(namespace).Get(context.TODO(), secretName, metav1.GetOptions{})
        return secret, err
}  

Now I need to write secret object to a file. I use file.StoreOutputinFile but I see O/P like

[91 66 108 117 101 10

In the file when I do

      storeOutput("./"+utils.FolderDir+"/storage-secret.log", sec.Data["slclient.toml"])