func encode(complexStructures []ComplexStruct) {

	var buf bytes.Buffer
	encoder := gob.NewEncoder(&buf)
	if err := encoder.Encode(&complexStructures); err != nil {
		panic(err)
	}
	// this is just an example! never write a file inside a function that way
	if err := os.WriteFile("complex_structures.gob", buf.Bytes(), os.ModePerm); err != nil {
		panic(err)
	}
}