fix running routes:cache error

fix UserBankSlip class not found
fix undefined book_id
added loading when confirm booking
added confirm booking success redirect with correct page
added error handling for upload user bankslip
completed upload user bankslip flow

app/Http/Controllers/UserController.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+
+class UserController extends Controller
+{
+
+
+    /**
+     * Display the specified resource.
+     *
+     * @param  \App\ChinaBankSlip  $chinaBankSlip
+     * @return \Illuminate\Http\Response
+     */
+    public function show(Request $request)
+    {
+        return $request->user();
+    }
+}