I am writing a CLI interface program in Go.my program requires a user to enter a filename as an argument . following is the code I wrote to handle the situations in which user doesn't enter any argument . but it panics and gives an error "index out of range".how do I handle this?<p>if len(os.Args) == 0 {
fmt.Println("usage: gohex <filename>")<p><pre><code> os.Exit(1)
}</code></pre>