refactoring, created email package

utils/utils.go

@@ -22,44 +22,6 @@ func SetDomains(slice []string) {
 	domains = slice
 }
 
-// Mailbox returns mailbox part from email address
-func Mailbox(email string) string {
-	index := strings.LastIndex(email, "@")
-	if index == -1 {
-		return email
-	}
-	return email[:index]
-}
-
-// EmailsList returns human-readable list of mailbox's emails for all available domains
-func EmailsList(mailbox string, domain string) string {
-	var msg strings.Builder
-	domain = SanitizeDomain(domain)
-	msg.WriteString(mailbox)
-	msg.WriteString("@")
-	msg.WriteString(domain)
-
-	count := len(domains) - 1
-	for i, aliasDomain := range domains {
-		if i < count {
-			msg.WriteString(", ")
-		}
-		if aliasDomain == domain {
-			continue
-		}
-		msg.WriteString(mailbox)
-		msg.WriteString("@")
-		msg.WriteString(aliasDomain)
-	}
-
-	return msg.String()
-}
-
-// Hostname returns hostname part from email address
-func Hostname(email string) string {
-	return email[strings.LastIndex(email, "@")+1:]
-}
-
 // SanitizeDomain checks that input domain is available for use
 func SanitizeDomain(domain string) string {
 	domain = strings.TrimSpace(domain)