Refactoring

1. Move all pre-defined messages to constants in a separate file
2. Remove pkg/errors dependency

pkg/anon3anon/infrastructure/telegram/handler/anonymousmessages.go

@@ -3,7 +3,7 @@ package handler
 import (
 	"context"
 
-	"github.com/nightnoryu/anon3anon/pkg/infrastructure/jsonlog"
+	"github.com/nightnoryu/anon3anon/pkg/anon3anon/infrastructure/jsonlog"
 
 	"github.com/go-telegram/bot"
 	"github.com/go-telegram/bot/models"
@@ -28,7 +28,7 @@ func NewAnonymousMessagesHandler(logger jsonlog.Logger, ownerChatId int) bot.Han
 
 		sendParams := &bot.SendMessageParams{
 			ChatID: update.Message.Chat.ID,
-			Text:   "Сообщение отправлено!!",
+			Text:   messageSentMessage,
 		}
 		_, err = b.SendMessage(ctx, sendParams)
 		if err != nil {

pkg/anon3anon/infrastructure/telegram/handler/messages.go

@@ -0,0 +1,6 @@
+package handler
+
+const (
+	greetingMessage    = "Жду твоих сообщений!!"
+	messageSentMessage = "Сообщение отправлено!!"
+)

pkg/anon3anon/infrastructure/telegram/handler/startcommand.go

@@ -3,7 +3,7 @@ package handler
 import (
 	"context"
 
-	"github.com/nightnoryu/anon3anon/pkg/infrastructure/jsonlog"
+	"github.com/nightnoryu/anon3anon/pkg/anon3anon/infrastructure/jsonlog"
 
 	"github.com/go-telegram/bot"
 	"github.com/go-telegram/bot/models"
@@ -11,9 +11,13 @@ import (
 
 func NewStartCommandHandler(logger jsonlog.Logger) bot.HandlerFunc {
 	return func(ctx context.Context, b *bot.Bot, update *models.Update) {
+		if update.Message == nil {
+			return
+		}
+
 		params := &bot.SendMessageParams{
 			ChatID: update.Message.Chat.ID,
-			Text:   "Жду твоих сообщений!!",
+			Text:   greetingMessage,
 		}
 		_, err := b.SendMessage(ctx, params)
 		if err != nil {

pkg/anon3anon/infrastructure/telegram/middleware/loggingmiddleware.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/nightnoryu/anon3anon/pkg/infrastructure/jsonlog"
+	"github.com/nightnoryu/anon3anon/pkg/anon3anon/infrastructure/jsonlog"
 
 	"github.com/go-telegram/bot"
 	"github.com/go-telegram/bot/models"