Go（Golang）-检查文件扩展名在Go中不起作用

I want to get a file path from the console and check if the file is a vm file. I wrote this code:

func main() {
reader := bufio.NewReader(os.Stdin)
fmt.Println("Enter the path of the vm file:")
path, _ := reader.ReadString('
')
if filepath.Ext(path) != ".vm" {
    fmt.Println("Error! file must be vm file")
}

but it's not working. I just started learn Go So please accept my apologies if this is a basic mistake.

The path, _ := reader.ReadString(' ') also returns the newline. So your comparing ".vm " with ".vm".

you should trimspace from the path if filepath.Ext(strings.TrimSpace(path)) != ".vm" {