Что написать на golang для практики?

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package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

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package main

import (
    "fmt"
    "os"
    "strconv"
)

func main() {
    if len(os.Args) != 4 {
        fmt.Println("Usage:   ")
        return
    }

    num1, _ := strconv.ParseFloat(os.Args[1], 64)
    operator := os.Args[2]
    num2, _ := strconv.ParseFloat(os.Args[3], 64)

    var result float64

    switch operator {
    case "+":
        result = num1 + num2
    case "-":
        result = num1 - num2
    case "*":
        result = num1 * num2
    case "/":
        result = num1 / num2
    default:
        fmt.Println("Invalid operator")
        return
    }

    fmt.Printf("%v %v %v = %v
", num1, operator, num2, result)
}

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package main

import (
    "fmt"
    "os"
    "strconv"
)

func factorial(n int) int {
    if n <= 0 {
        return 1
    }
    return n * factorial(n-1)
}

func main() {
    if len(os.Args) != 2 {
        fmt.Println("Usage: ")
        return
    }

    num, err := strconv.Atoi(os.Args[1])
    if err != nil {
        fmt.Println("Invalid number")
        return
    }

    result := factorial(num)
    fmt.Printf("Factorial of %d = %d
", num, result)
}