code: func (k *KubeadmCert) GetConfig(ic *kubeadmapi.InitConfiguration) (*certutil.Config, error) {
  	for _, f := range k.configMutators {
  		if err := f(ic, &k.config); err != nil {
  			return nil, err
  		}
  	}
  
  	return &k.config, nil
  }
docs: // GetConfig returns the definition for the given cert given the provided InitConfiguration