using superheroes for refresh my mind about Golang structs

package main

import "fmt"

type skill struct {
    Power string
}

type hero struct {
    Name  string
    Alias string
    skill
}

func main() {
    h1 := hero{
        Name:  "Bruce Wayne",
        Alias: "Batman",
        skill: skill{
            Power: "a lot of gadgets",
        },
    }
    h2 := hero{
        Name:  "Tony Stark",
        Alias: "Iron",
        skill: skill{
            Power: "hi-tech armor",
        },
    }

    fmt.Printf("the best skill of %s is %s \n", h1.Alias, h1.skill.Power)
    fmt.Printf("the best skill of %s is %s \n", h2.Alias, h2.skill.Power)

    s1 := skill{
        Power: "velocity",
    }

    h3 := hero{
        Name:  "Barry Allen",
        Alias: "Flash",
        skill: skill{
            Power: s1.Power,
        },
    }

    fmt.Printf("the best skill of %s is %s \n", h3.Alias, h3.skill.Power)
}

package main

import "fmt"

type skill struct {
    Power string
}

type hero struct {
    Name  string
    Alias string
}

type heroSkill struct {
    hero
    skill
}

func main() {
    hs1 := heroSkill{
        hero: hero{
            Name:  "Clark Kent / Kal-El",
            Alias: "Superman",
        },
        skill: skill{
            Power: "a lot of cool superpowers",
        },
    }

    hs2 := heroSkill{
        hero: hero{
            Name:  "Steve Rogers",
            Alias: "Capitan America",
        },
        skill: skill{
            Power: "strong",
        },
    }

    fmt.Printf("the best skill of %s is %s \n", hs1.hero.Alias, hs1.skill.Power)
    // check the different way to call the struct, in this second Print, there no need to call the sub struct.
    fmt.Printf("the best skill of %s is %s \n", hs2.Alias, hs2.Power)
}