refactor: extract Destination type from EmailRequest for improved structure

client/types.go

@@ -18,16 +18,18 @@ type Message struct {
 	Subject Data `json:"Subject"`
 }
 
+type Destination struct {
+	ToAddresses  Addresses `json:"ToAddresses"`
+	CcAddresses  Addresses `json:"CcAddresses,omitempty"`
+	BccAddresses Addresses `json:"BccAddresses,omitempty"`
+}
+
 type EmailRequest struct {
-	Source      string `json:"Source"`
-	Destination struct {
-		ToAddresses  Addresses `json:"ToAddresses"`
-		CcAddresses  Addresses `json:"CcAddresses"`
-		BccAddresses Addresses `json:"BccAddresses"`
-	} `json:"Destination"`
-	Message       Message   `json:"Message"`
-	ScheduledTime time.Time `json:"ScheduledTime,omitempty"`
-	Catch         bool      `json:"Catch,omitempty"`
+	Source        string      `json:"Source"`
+	Destination   Destination `json:"Destination"`
+	Message       Message     `json:"Message"`
+	ScheduledTime time.Time   `json:"ScheduledTime,omitempty"`
+	Catch         bool        `json:"Catch,omitempty"`
 }
 
 type Email struct {