Fix issue #1127 (#1131)

* fix #1127

* fix #1127

* fixed unit test

* add go keyword converter

Co-authored-by: anqiansong <anqiansong@bytedance.com>

tools/goctl/util/string_test.go

@@ -1,6 +1,7 @@
 package util
 
 import (
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -64,3 +65,10 @@ func TestSafeString(t *testing.T) {
 		assert.Equal(t, e.expected, SafeString(e.input))
 	}
 }
+
+func TestEscapeGoKeyword(t *testing.T) {
+	for k := range goKeyword {
+		assert.Equal(t, goKeyword[k], EscapeGolangKeyword(k))
+		assert.False(t, isGolangKeyword(strings.Title(k)))
+	}
+}