In golang, there are two way of joining filepath.

homedir.go

package main

import (
	"fmt"
	"os/user"
	"path"
	"path/filepath"
)

var dbPath = "/.config/go-wol/bolt.db"

func main() {
	u, err := user.Current()
	panicOnError(err)
	var home = u.HomeDir

	fmt.Print("path: ")
	fmt.Println(path.Join(home, dbPath))

	fmt.Print("filepath: ")
	fmt.Println(filepath.Join(home, dbPath))
}

func panicOnError(err error) {
	if err != nil {
		panic(err)
	}
}