diff --git a/cmd/goforward/root.go b/cmd/goforward/root.go
index b347298..00c48a6 100644
--- a/cmd/goforward/root.go
+++ b/cmd/goforward/root.go
@@ -63,7 +63,7 @@ var rootCmd = &cobra.Command{
 		if err != nil {
 			return err
 		}
-		err = runServer(*cfg)
+		err = runServer(cfg)
 		if err != nil {
 			fmt.Println(err)
 			os.Exit(1)
@@ -79,7 +79,7 @@ func Execute() {
 	}
 }
 
-func runServer(cfg config.Config) (err error) {
+func runServer(cfg *config.Config) (err error) {
 	log.InitLog(cfg.LogWay, cfg.LogFile, cfg.LogLevel, cfg.LogMaxDays, cfg.DisableLogColor)
 
 	if cfgFile != "" {
diff --git a/internal/api/forward/add.go b/internal/api/forward/add.go
index 62f2006..badba1e 100644
--- a/internal/api/forward/add.go
+++ b/internal/api/forward/add.go
@@ -16,7 +16,7 @@ type AddForwardRequest struct {
 func Add(c *gin.Context) {
 	var request AddForwardRequest
 	c.ShouldBindJSON(&request)
-	if len(request.ForwardLink) == 0 {
+	if request.ForwardLink == "" {
 		c.JSON(400, gin.H{"error": "forward link is empty"})
 		return
 	}
diff --git a/internal/api/forward/del.go b/internal/api/forward/del.go
index 596406a..8e3d6c4 100644
--- a/internal/api/forward/del.go
+++ b/internal/api/forward/del.go
@@ -11,7 +11,7 @@ import (
 func Del(c *gin.Context) {
 	m := manager.GetInstance()
 	listenAddr := c.Param("listen_addr")
-	if len(listenAddr) == 0 {
+	if listenAddr == "" {
 		c.JSON(400, gin.H{"error": "listen_addr is empty"})
 		return
 	}
diff --git a/internal/constants/version.go b/internal/constants/version.go
index cbdb547..3af3010 100644
--- a/internal/constants/version.go
+++ b/internal/constants/version.go
@@ -1,3 +1,3 @@
 package constants
 
-const VERSION = "0.1.0"
+const VERSION = "0.1.1"
diff --git a/internal/manager/manager.go b/internal/manager/manager.go
index 760080b..5b96783 100644
--- a/internal/manager/manager.go
+++ b/internal/manager/manager.go
@@ -11,10 +11,10 @@ type Manager struct {
 	ForwardMap map[string]*forward.Forward
 }
 
-func (m Manager) AddForward(ForwardLinks models.ForwardLinks, override bool) error {
-	for _, i := range ForwardLinks {
+func (m Manager) AddForward(forwardLinks models.ForwardLinks, override bool) error {
+	for _, i := range forwardLinks {
 		key := i.ListenAddr.String()
-		forward := forward.NewForward(i)
+		forwardIns := forward.NewForward(i)
 		if f, ok := m.ForwardMap[key]; ok {
 			if override {
 				err := f.Stop()
@@ -25,11 +25,11 @@ func (m Manager) AddForward(ForwardLinks models.ForwardLinks, override bool) err
 				return fmt.Errorf("forward %s already exists, if want to override, set param override to true", key)
 			}
 		}
-		err := forward.Start()
+		err := forwardIns.Start()
 		if err != nil {
 			return fmt.Errorf("forward %s start err: %s", key, err)
 		}
-		m.ForwardMap[key] = forward
+		m.ForwardMap[key] = forwardIns
 	}
 	return nil
 }
diff --git a/internal/pkg/forward/forward.go b/internal/pkg/forward/forward.go
index 36bb554..cb1b925 100644
--- a/internal/pkg/forward/forward.go
+++ b/internal/pkg/forward/forward.go
@@ -111,9 +111,9 @@ func (f *Forward) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func NewForward(ForwardLink models.ForwardLink) *Forward {
+func NewForward(forwardLink models.ForwardLink) *Forward {
 	return &Forward{
-		Link: ForwardLink,
+		Link: forwardLink,
 		quit: make(chan bool, 1),
 	}
 }
diff --git a/internal/pkg/log/log.go b/internal/pkg/log/log.go
index 631ed47..c3321da 100644
--- a/internal/pkg/log/log.go
+++ b/internal/pkg/log/log.go
@@ -16,14 +16,14 @@ func init() {
 	Log.SetLogFuncCallDepth(Log.GetLogFuncCallDepth() + 1)
 }
 
-func InitLog(logWay string, logFile string, logLevel string, maxdays int64, disableLogColor bool) {
+func InitLog(logWay, logFile, logLevel string, maxdays int64, disableLogColor bool) {
 	SetLogFile(logWay, logFile, maxdays, disableLogColor)
 	SetLogLevel(logLevel)
 }
 
 // SetLogFile to configure log params
 // logWay: file or console
-func SetLogFile(logWay string, logFile string, maxdays int64, disableLogColor bool) {
+func SetLogFile(logWay, logFile string, maxdays int64, disableLogColor bool) {
 	if logWay == "console" {
 		params := ""
 		if disableLogColor {
@@ -31,7 +31,7 @@ func SetLogFile(logWay string, logFile string, maxdays int64, disableLogColor bo
 		}
 		Log.SetLogger("console", params)
 	} else {
-		params := fmt.Sprintf(`{"filename": "%s", "maxdays": %d}`, logFile, maxdays)
+		params := fmt.Sprintf(`{"filename": "%q", "maxdays": %d}`, logFile, maxdays)
 		Log.SetLogger("file", params)
 	}
 }
diff --git a/internal/util/util.go b/internal/util/util.go
deleted file mode 100644
index 6cf1e72..0000000
--- a/internal/util/util.go
+++ /dev/null
@@ -1,52 +0,0 @@
-package util
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-)
-
-func ParseRangeNumbers(rangeStr string) (numbers []int64, err error) {
-	rangeStr = strings.TrimSpace(rangeStr)
-	numbers = make([]int64, 0)
-	// e.g. 1000-2000,2001,2002,3000-4000
-	numRanges := strings.Split(rangeStr, ",")
-	for _, numRangeStr := range numRanges {
-		// 1000-2000 or 2001
-		numArray := strings.Split(numRangeStr, "-")
-		// length: only 1 or 2 is correct
-		rangeType := len(numArray)
-		if rangeType == 1 {
-			// single number
-			singleNum, errRet := strconv.ParseInt(strings.TrimSpace(numArray[0]), 10, 64)
-			if errRet != nil {
-				err = fmt.Errorf("range number is invalid, %v", errRet)
-				return
-			}
-			numbers = append(numbers, singleNum)
-		} else if rangeType == 2 {
-			// range numbers
-			min, errRet := strconv.ParseInt(strings.TrimSpace(numArray[0]), 10, 64)
-			if errRet != nil {
-				err = fmt.Errorf("range number is invalid, %v", errRet)
-				return
-			}
-			max, errRet := strconv.ParseInt(strings.TrimSpace(numArray[1]), 10, 64)
-			if errRet != nil {
-				err = fmt.Errorf("range number is invalid, %v", errRet)
-				return
-			}
-			if max < min {
-				err = fmt.Errorf("range number is invalid")
-				return
-			}
-			for i := min; i <= max; i++ {
-				numbers = append(numbers, i)
-			}
-		} else {
-			err = fmt.Errorf("range number is invalid")
-			return
-		}
-	}
-	return
-}
diff --git a/internal/util/util_test.go b/internal/util/util_test.go
deleted file mode 100644
index 2254d51..0000000
--- a/internal/util/util_test.go
+++ /dev/null
@@ -1,33 +0,0 @@
-package util
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestParseRangeNumbers(t *testing.T) {
-	assert := assert.New(t)
-	numbers, err := ParseRangeNumbers("2-5")
-	if assert.NoError(err) {
-		assert.Equal([]int64{2, 3, 4, 5}, numbers)
-	}
-
-	numbers, err = ParseRangeNumbers("1")
-	if assert.NoError(err) {
-		assert.Equal([]int64{1}, numbers)
-	}
-
-	numbers, err = ParseRangeNumbers("3-5,8")
-	if assert.NoError(err) {
-		assert.Equal([]int64{3, 4, 5, 8}, numbers)
-	}
-
-	numbers, err = ParseRangeNumbers(" 3-5,8, 10-12 ")
-	if assert.NoError(err) {
-		assert.Equal([]int64{3, 4, 5, 8, 10, 11, 12}, numbers)
-	}
-
-	_, err = ParseRangeNumbers("3-a")
-	assert.Error(err)
-}