Implement #CZ2

app/main.go

 package main
 
 import (
+	"bufio"
 	"fmt"
+	"os"
 )
 
 // Ensures gofmt doesn't remove the "fmt" import in stage 1 (feel free to remove this!)
 
 func main() {
 	fmt.Print("$ ")
+	command, err := bufio.NewReader(os.Stdin).ReadString('\n')
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Error reading input: ", err)
+		os.Exit(1)
+	}
+	fmt.Println(command[:len(command)-1] + ": command not found")
 }