Added a new module called return_a_random_greeting

Author: anarchymonkey

return_a_random_greeting/greetings/go.mod

@@ -0,0 +1,3 @@
+module aniket-batabyal.com/greetings
+
+go 1.20

return_a_random_greeting/greetings/greetings.go

@@ -0,0 +1,57 @@
+package greetings
+
+import (
+	"errors"
+	"fmt"
+	"math/rand"
+	"time"
+)
+
+func GreetUser(name string) (string, error) {
+
+	if name == "" {
+		return "", errors.New("the name cannot be empty or nil")
+	}
+	message := fmt.Sprintf(randomHello(), name)
+	return message, nil
+}
+
+func GreetUsers(names []string) (map[string]string, error) {
+
+	// make the messages map by using the make function
+	messages := make(map[string]string)
+
+	// loop through the names slice
+	for idx, name := range names {
+		fmt.Println("Index is: ", idx)
+
+		// call greet user and get the message and the error
+		message, err := GreetUser(name)
+
+		// if error is nil then return the error
+		if err != nil {
+			return nil, err
+		}
+
+		messages[name] = message
+	}
+
+	return messages, nil
+}
+
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
+func randomHello() string {
+
+	formattedHellos := []string{
+		"Hey mate! %v",
+		"Hola %v",
+		"konichiwa %v",
+	}
+
+	// fmt.Println("The length of the formatted hellos screen is", len(formattedHellos))
+
+	return formattedHellos[rand.Intn(len(formattedHellos))]
+}