How to get the file name extension used by path in Golang?

Syntax:

func Ext(path string) string

Consider the below Golang program demonstrating get the file name extension used by the given path?

package main

import (
	"fmt"
	"path/filepath"
)

func main() {
	ext1 := filepath.Ext("/tmp/test.go")
	fmt.Println("ext1:", ext1)

	ext2 := filepath.Ext("./picture1.jpg")
	fmt.Println("ext2:", ext2)
}

Output

ext1: .go
ext2: .jpg