Get current file name after creating executable

I can get the current directory and the name of the current .go file but if i build a .exe from the file with go build then i still get the .go name.

.../Project/Test/testfile.go

After building testfile.go with go build i have these:

1) .../Project/Test/testfile.go

2) .../Project/Test/main.exe

When i execute main.exe i get testfile But i want to get the main name after executing main.exe

package main

import (
    "errors"
    "fmt"
    "path/filepath"
    "runtime"
    "strings"
)

func GetFileName() string {
    _, fpath, _, ok := runtime.Caller(0)
    if !ok {
        err := errors.New("failed to get filename")
        panic(err)
    }
    filename := filepath.Base(fpath)
    filename = strings.Replace(filename, ".go", "", 1)
    return filename
}

func main() {
    fmt.Print(GetFileName())
}

The os package provides os.Args[0] to obtain the executable name, or if you want the whole path you could use os.Executable, as @Peter has suggested