diff --git a/color.go b/color.go
index 9ee7eea..d32b23d 100644
--- a/color.go
+++ b/color.go
@@ -47,7 +47,7 @@ type Window struct {
 	dst Colors
 }
 
-func (w *Window) color_init() {
+func (w *Window) colorInit() {
 	if transparent {
 		w.src.background_color = Transparent
 		w.dst.background_color = Transparent
diff --git a/language.go b/language.go
index c342909..114b3c2 100644
--- a/language.go
+++ b/language.go
@@ -112,7 +112,7 @@ var (
 		"Yoruba",
 		"Zulu",
 	}
-	Lang_Code = map[string]string{
+	LangCode = map[string]string{
 		"Afrikaans":                     "af",
 		"Albanian":                      "sq",
 		"Amharic":                       "am",
diff --git a/main.go b/main.go
index 2278a8e..5209d24 100644
--- a/main.go
+++ b/main.go
@@ -27,7 +27,7 @@ func main() {
 	translator.dst_lang = "Chinese (Traditional)"
 	// result, _ := translator.Translate("Hello world\nApple\nbumper")
 	// fmt.Println(result)
-	window.color_init()
+	window.colorInit()
 	ui_init()
 	translate_page.SetDirection(tview.FlexColumn).
 		AddItem(src_box, 0, 1, true).
diff --git a/translator.go b/translator.go
index de31f3c..8293246 100644
--- a/translator.go
+++ b/translator.go
@@ -28,8 +28,8 @@ func (t Translator) Translate(message string) (string, error) {
 
 	url_str := fmt.Sprintf(
 		api_url,
-		Lang_Code[t.src_lang],
-		Lang_Code[t.dst_lang],
+		LangCode[t.src_lang],
+		LangCode[t.dst_lang],
 		url.QueryEscape(message),
 	)
 	res, err := http.Get(url_str)
@@ -61,7 +61,7 @@ func (t Translator) PlaySound(lang string, message string) {
 	url_str := fmt.Sprintf(
 		sound_url,
 		url.QueryEscape(message),
-		Lang_Code[lang],
+		LangCode[lang],
 	)
 	res, err := http.Get(url_str)
 	if err != nil {
diff --git a/ui.go b/ui.go
index 273cbf3..4b1c87f 100644
--- a/ui.go
+++ b/ui.go
@@ -73,10 +73,10 @@ func ui_init() {
 	// handler
 	pages.SetInputCapture(PagesHandler)
 	translate_page.SetInputCapture(TranslatePageHandler)
-	src_dropdown.SetDoneFunc(SrcDropDownHandler)
-	src_dropdown.SetSelectedFunc(SrcSelected)
-	dst_dropdown.SetDoneFunc(DstDropDownHandler)
-	dst_dropdown.SetSelectedFunc(DstSelected)
+	src_dropdown.SetDoneFunc(SrcDropDownHandler).
+		SetSelectedFunc(SrcSelected)
+	dst_dropdown.SetDoneFunc(DstDropDownHandler).
+		SetSelectedFunc(DstSelected)
 }
 
 func PagesHandler(event *tcell.EventKey) *tcell.EventKey {