os.go
func GetenvDefault(key, defaultValue string) string {
	ret := os.Getenv(key)
	if ret == "" {
		return defaultValue
	}

	return ret
}
func GetenvDefault(key, defaultValue string) string {
	ret := os.Getenv(key)
	if ret == "" {
		return defaultValue
	}

	return ret
}
func GetenvDefault ( key , defaultValue string ) string { ret := os . Getenv ( key ) if ret == " " { return defaultValue } return ret }
// GetenvDefault retrieves the value of the environment variable
// named by the key. It returns the given defaultValue if the
// variable is not present.
GetenvDefault retrieves the value of the environment variable named by the key . It returns the given defaultValue if the variable is not present .