This Go program demonstrates struct embedding aka automatic boilerplate free delegation. Try it out https://go.dev/play/p/0rauYusjgh8

main.go

package main

import "fmt"

type FifthLevelA struct{}

func (f FifthLevelA) ExecuteA() string {
	return "executed in fifth level"
}

type FifthLevelB struct{}

func (f FifthLevelB) ExecuteB() string {
	return "executed in fifth level"
}

type FourthLevel struct {
	FifthLevelA
	FifthLevelB
}

type ThirdLevel struct {
	FourthLevel
}

type SecondLevel struct {
	ThirdLevel
}

type FirstLevel struct {
	SecondLevel
}

func main() {
	top := FirstLevel{}
	fmt.Println(top.ExecuteA()) // → "executed in fifth level"
	fmt.Println(top.ExecuteB()) // → "executed in fifth level"
}