refactor code structure (#1738)

pkg/api/utils.go

@@ -0,0 +1,16 @@
+package api
+
+import (
+    "github.com/emicklei/go-restful"
+    "net/http"
+)
+
+func HandleInternalError(response *restful.Response, err error) {
+    statusCode := http.StatusInternalServerError
+
+    response.WriteError(statusCode, err)
+}
+
+func HandleBadRequest(response *restful.Response, err error) {
+
+}