Multiple static files directories - go

Question

In go, we can handle static files, by defining their directory as static directory as shown below:
fs := http.FileServer(http.Dir("./static/"))
http.Handle("/files/", fs)
Where static files folder static should be beside the binary.
Another way, is to use the new //go embed as:
//go:embed static
var staticFiles embed.FS
// http.FS can be used to create a http Filesystem
var staticFS = http.FS(staticFiles)
fs := http.FileServer(staticFS) // embeded static files
// Serve static files
http.Handle("/static/", fs)
But what if I want to have most of my static files embedded in the binary, and some are not, that can be used alongside the binary, I tried to mix both method defined above, but did not work, only the embedded ones run smoothly, below code failed, any thought?:
//go:embed static
var staticFiles embed.FS
// http.FS can be used to create a http Filesystem
var staticFS = http.FS(staticFiles)
fs := http.FileServer(staticFS) // embeded static files
// Serve static files
http.Handle("/static/", fs)
www := http.FileServer(http.Dir("./files/")) // side static files, to be beside binary
// Serve static files
http.Handle("/files/", www)

Answer 1

I found it, was missing http.StripPrefix, below worked perfectly with me, and have multiple static folders:
package main
import (
"embed"
"encoding/json"
"fmt"
"log"
"net/http"
)
//go:embed static
var staticFiles embed.FS
func main() {
go func() {
http.HandleFunc("/favicon.ico", func(rw http.ResponseWriter, r *http.Request) {})
// http.FS can be used to create a http Filesystem
var staticFS = http.FS(staticFiles)
fs := http.FileServer(staticFS) // embeded static files
// Serve static files, to be embedded in the binary
http.Handle("/static/", fs)
// Serve public files, to be beside binary
http.Handle("/public/", http.StripPrefix("/public/", http.FileServer(http.Dir("./files"))))
http.HandleFunc("/getSkills", getSkills)
log.Println("Listening on :3000...")
err := http.ListenAndServe(":3000", nil)
if err != nil {
log.Fatal(err)
}
}