first upload all files

Modules/Compare/Http/Controllers/CompareController.php

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+<?php
+
+namespace Modules\Compare\Http\Controllers;
+
+use Modules\Compare\Compare;
+
+class CompareController
+{
+    /**
+     * Display a listing of the resource.
+     *
+     * @param \Modules\Compare\Compare $compare
+     * @return \Illuminate\Http\Response
+     */
+    public function index(Compare $compare)
+    {
+        return view('public.compare.index', compact('compare'));
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param \Modules\Compare\Compare $compare
+     * @return \Illuminate\Http\Response
+     */
+    public function store(Compare $compare)
+    {
+        $compare->store(request('productId'));
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     *
+     * @param int $productId
+     * @param \Modules\Compare\Compare $compare
+     * @return \Illuminate\Http\Response
+     */
+    public function destroy($productId, Compare $compare)
+    {
+        $compare->remove($productId);
+    }
+}

Modules/Compare/Http/Controllers/CompareRelatedProductController.php

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+<?php
+
+namespace Modules\Compare\Http\Controllers;
+
+use Modules\Compare\Compare;
+
+class CompareRelatedProductController
+{
+    /**
+     * Display a listing of the resource.
+     *
+     * @param \Modules\Compare\Compare $compare
+     * @return \Illuminate\Http\Response
+     */
+    public function index(Compare $compare)
+    {
+        return $compare->relatedProducts();
+    }
+}