diff --git a/Makefile b/Makefile
index f3676cd..238a31a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,6 @@
+GOFMT ?= gofmt
+GOFILES := $(shell find . -name "*.go")
+
 .PHONY: test
 test: # 進行測試
 	go test -v --cover ./...
diff --git a/errors/easy_func_test.go b/errors/easy_func_test.go
index a3ef45c..57a03eb 100644
--- a/errors/easy_func_test.go
+++ b/errors/easy_func_test.go
@@ -1030,3 +1030,40 @@ func TestFromError(t *testing.T) {
 		})
 	}
 }
+
+func Test_newErr(t *testing.T) {
+	type args struct {
+		scope  uint32
+		detail uint32
+		msg    string
+	}
+	tests := []struct {
+		name string
+		args args
+	}{
+		{
+			name: "ok",
+			args: args{
+				scope:  code.CloudEPMember,
+				detail: code.InvalidFormat,
+				msg:    "gg88g88",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			er := newErr(tt.args.scope, tt.args.detail, tt.args.msg)
+			// er.CodeStr() 會補滿6碼，業務邏輯要回應這個
+			// 105,060 前面兩位會乘一萬做計算，中間兩位乘100 來做計算最後用補的
+			fmt.Println(er.Scope(), er.Category(), er.Code(), er.FullCode(), er.CodeStr())
+			fmt.Println(er.Error()) // 建立十原始錯誤 -> 業務邏輯，給客人看 gg88g88
+			er2 := fmt.Errorf("test origin err")
+			er = er.Wrap(er2)       // 包裝錯誤
+			fmt.Println(er.Error()) // gg88g88: test origin err
+			err := er.Unwrap()
+			if err != nil {
+				return
+			}
+		})
+	}
+}
diff --git a/errors/errors.go b/errors/errors.go
index dec0bf9..dafb78b 100644
--- a/errors/errors.go
+++ b/errors/errors.go
@@ -77,10 +77,10 @@ func (e *LibError) CodeStr() string {
 	}
 
 	if e.Category() == code2.CatGRPC {
-		return fmt.Sprintf("%d%04d", e.Scope(), e.Category()+e.Code())
+		return fmt.Sprintf("%02d%04d", e.Scope(), e.Category()+e.Code())
 	}
 
-	return fmt.Sprintf("%d%04d", e.Scope(), e.Code())
+	return fmt.Sprintf("%02d%04d", e.Scope(), e.Code())
 }
 
 // Code 私有屬性 "code" 的 getter 函數
diff --git a/errs/easy_func.go b/errs/easy_func.go
index ddf1782..8f22ef1 100644
--- a/errs/easy_func.go
+++ b/errs/easy_func.go
@@ -1,12 +1,13 @@
 package errs
 
 import (
-	"code.30cm.net/digimon/library-go/errs/code"
 	"errors"
 	"fmt"
+	"strings"
+
+	"code.30cm.net/digimon/library-go/errs/code"
 	"github.com/zeromicro/go-zero/core/logx"
 	"google.golang.org/grpc/status"
-	"strings"
 )
 
 const (
diff --git a/errs/easy_func_test.go b/errs/easy_func_test.go
index 8ee416a..a07633c 100644
--- a/errs/easy_func_test.go
+++ b/errs/easy_func_test.go
@@ -1,10 +1,11 @@
 package errs
 
 import (
-	"code.30cm.net/digimon/library-go/errs/code"
 	"context"
-	"github.com/zeromicro/go-zero/core/logx"
 	"testing"
+
+	"code.30cm.net/digimon/library-go/errs/code"
+	"github.com/zeromicro/go-zero/core/logx"
 )
 
 func TestFromError(t *testing.T) {
diff --git a/errs/errors.go b/errs/errors.go
index 6d9a1f6..68b2f9d 100644
--- a/errs/errors.go
+++ b/errs/errors.go
@@ -1,12 +1,13 @@
 package errs
 
 import (
-	"code.30cm.net/digimon/library-go/errs/code"
 	"errors"
 	"fmt"
+	"net/http"
+
+	"code.30cm.net/digimon/library-go/errs/code"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
-	"net/http"
 )
 
 // Scope 全域變數應由服務或模組設置
diff --git a/errs/errors_test.go b/errs/errors_test.go
index 3e72bc6..8859f45 100644
--- a/errs/errors_test.go
+++ b/errs/errors_test.go
@@ -1,11 +1,12 @@
 package errs
 
 import (
-	"code.30cm.net/digimon/library-go/errs/code"
 	"errors"
-	"google.golang.org/grpc/codes"
 	"net/http"
 	"testing"
+
+	"code.30cm.net/digimon/library-go/errs/code"
+	"google.golang.org/grpc/codes"
 )
 
 func TestNewError(t *testing.T) {
diff --git a/go.work b/go.work
index 90a2422..fc827c6 100644
--- a/go.work
+++ b/go.work
@@ -5,4 +5,5 @@ use (
 	./validator
 	./worker_pool
 	./jwt
+	./errs
 )