diff --git a/api/account.go b/api/account.go
index 37cf9a1..37c4c7f 100644
--- a/api/account.go
+++ b/api/account.go
@@ -1,8 +1,8 @@
 package api
 
 import (
-	"arimelody-web/account/controller"
-	"arimelody-web/account/model"
+	"arimelody-web/controller"
+	"arimelody-web/model"
 	"arimelody-web/global"
 	"encoding/json"
 	"fmt"
diff --git a/account/controller/account.go b/controller/account.go
similarity index 80%
rename from account/controller/account.go
rename to controller/account.go
index 267c43b..a34cd27 100644
--- a/account/controller/account.go
+++ b/controller/account.go
@@ -1,7 +1,8 @@
 package controller
 
 import (
-	"arimelody-web/account/model"
+	"arimelody-web/model"
+	"math/rand"
 
 	"github.com/jmoiron/sqlx"
 )
@@ -58,3 +59,13 @@ func DeleteAccount(db *sqlx.DB, accountID string) error {
     _, err := db.Exec("DELETE FROM account WHERE id=$1", accountID)
     return err
 }
+
+var inviteChars = []byte("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
+
+func GenerateInviteCode(length int) []byte {
+    code := []byte{}
+    for i := 0; i < length; i++ {
+        code = append(code, inviteChars[rand.Intn(len(inviteChars) - 1)])
+    }
+    return code
+}
diff --git a/main.go b/main.go
index ad6db3c..552a83d 100644
--- a/main.go
+++ b/main.go
@@ -9,11 +9,11 @@ import (
 	"path/filepath"
 	"time"
 
-	"arimelody-web/account/model"
 	"arimelody-web/admin"
 	"arimelody-web/api"
 	"arimelody-web/global"
 	"arimelody-web/view"
+	"arimelody-web/controller"
 	"arimelody-web/templates"
 
 	"github.com/jmoiron/sqlx"
@@ -47,7 +47,7 @@ func main() {
     accountsCount := 0
     global.DB.Get(&accountsCount, "SELECT count(*) FROM account")
     if accountsCount == 0 {
-        code := model.GenerateInviteCode(8)
+        code := controller.GenerateInviteCode(8)
 
         tx, err := global.DB.Begin()
         if err != nil {
diff --git a/account/model/account.go b/model/account.go
similarity index 80%
rename from account/model/account.go
rename to model/account.go
index db32451..16b0e3b 100644
--- a/account/model/account.go
+++ b/model/account.go
@@ -1,7 +1,6 @@
 package model
 
 import (
-	"math/rand"
 	"time"
 )
 
@@ -42,13 +41,3 @@ const (
     ReadArtists AccountPrivilege = "read_artists"
     EditArtists AccountPrivilege = "edit_artists"
 )
-
-var inviteChars = []byte("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
-
-func GenerateInviteCode(length int) []byte {
-    code := []byte{}
-    for i := 0; i < length; i++ {
-        code = append(code, inviteChars[rand.Intn(len(inviteChars) - 1)])
-    }
-    return code
-}