func checkLine(line string) (string, string, bool) {
	key := ""
	value := ""
	sp := strings.SplitN(line, "=", 2)
	if len(sp) != 2 {
		return key, value, false
	}
	key = strings.TrimSpace(sp[0])
	value = strings.TrimSpace(sp[1])
	return key, value, true
}
func checkLine(line string) (string, string, bool) {
	key := ""
	value := ""
	sp := strings.SplitN(line, "=", 2)
	if len(sp) != 2 {
		return key, value, false
	}
	key = strings.TrimSpace(sp[0])
	value = strings.TrimSpace(sp[1])
	return key, value, true
}
// To check this line is a valid key-value pair or not.