code: func SetKubernetesVersion(cfg *kubeadmapiv1beta2.ClusterConfiguration) {
  
  	if cfg.KubernetesVersion != kubeadmapiv1beta2.DefaultKubernetesVersion && cfg.KubernetesVersion != "" {
  		return
  	}
  	cfg.KubernetesVersion = version.Get().String()
  }
docs: // SetKubernetesVersion gets the current Kubeadm version and sets it as KubeadmVersion in the config,
  // unless it's already set to a value different from the default.