package main

import "fmt"

const (
    spanish = "Spanish"
    french = "French"

    englishHelloPrefix = "Hello, "
    spanishHelloPrefix = "Hola, "
    frenchHelloPrefix = "Bonjour, "
)

func greetingPrefix(language string) (prefix string) {
    switch language {
        case french:
            prefix = frenchHelloPrefix
        case spanish:
            prefix = spanishHelloPrefix
        default:
            prefix = englishHelloPrefix
    }
    return
}

func Hello(name string, language string) string {
    if name == "" {
        name = "world"
    }

    return greetingPrefix(language) + name
}

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