func GetStringPtr(d *schema.ResourceData, key string) *string {
	v, e := d.GetOkExists(key)
	if e {
		return StringPtr(v.(string))
	}
	return nil
}
func GetStringPtr(d *schema.ResourceData, key string) *string {
	v, e := d.GetOkExists(key)
	if e {
		return StringPtr(v.(string))
	}
	return nil
}
// GetStringPtr reads a ResourceData and returns an appropriate *string for the
// state of the definition. nil is returned if it does not exist.