如何在golan main函数中调用没有输入和输出的函数？

I have a simple main.go file as follows:

package main

import "fmt"

func init() {
    fmt.Println("init!")
}

func main() {
    // init()
    fmt.Println("main")
}

When I run this program I see the following output!

init
main

I'm getting totally confused! I guess both functions with func() signature get run as entry points. But, more interestingly, I can't make a call to init function in main!

Can anyone please explain me what's wrong with this code?

init is a special name for a function that initializes a package. It's called automatically, and the spec mentions "init functions cannot be referred to from anywhere in a program". You should use any other name.