gconfig.go
func (c GConfig) getStringValue(key string) string {
	v := c.getValue(key)
	strV := v.(string)
	if s.HasPrefix(strV, "${") && s.HasSuffix(strV, "}") {
		return os.ExpandEnv(strV)
	}

	return strV
}
func (c GConfig) getStringValue(key string) string {
	v := c.getValue(key)
	strV := v.(string)
	if s.HasPrefix(strV, "${") && s.HasSuffix(strV, "}") {
		return os.ExpandEnv(strV)
	}

	return strV
}
// getStringValue returns a value for a given key as type interface which is converted
// to actual return type by individual Get* functions.