func StrEnvDef(env string, def string) string {
	val := os.Getenv(env)
	if val == "" {
		return def
	}
	return val
}
func StrEnvDef(env string, def string) string {
	val := os.Getenv(env)
	if val == "" {
		return def
	}
	return val
}
func StrEnvDef ( env string , def string ) string { val := os . Getenv ( env ) if val == " " { return def } return val }
// StrEnvDef get environment variable, or some default def
StrEnvDef get environment variable or some default def