Reorganize directory structures

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/utils/utils.go

@@ -0,0 +1,24 @@
+package utils
+
+import (
+	"encoding/base64"
+	"honoka-chan/pkg/db"
+	"honoka-chan/pkg/encrypt"
+)
+
+func CheckErr(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func IsSigned(unitId int) bool {
+	exists, err := db.MainEng.Table("unit_sign_asset_m").Where("unit_id = ?", unitId).Exist()
+	CheckErr(err)
+
+	return exists
+}
+
+func GenXMS(resp []byte) string {
+	return base64.StdEncoding.EncodeToString(encrypt.RSASignSHA1(resp))
+}