add function update address

app/Http/Controllers/Controller.php

 {
     use AuthorizesRequests, DispatchesJobs, ValidatesRequests;
 
-    public function updateCity()
+    public function updateAddress()
     {
         $subscribers = Subscriber::all();
 
         foreach ($subscribers as $key => $a) {
-            $a->unit_no = strtoupper($a->unit_no);
-            $a->building_name = strtoupper($a->building_name);
-            $a->street = strtoupper($a->street);
-            $a->city = strtoupper($a->city);
-            $a->state = strtoupper($a->state);
-            $a->save();
+            if($a->unit_no != '' || $a->unit_no != null){
+                $a->unit_no = strtoupper($a->unit_no); 
+            }
+            if ($a->building_name != '' || $a->building_name != null) {
+                $a->building_name = strtoupper($a->building_name);
+            }
+            if ($a->street != '' || $a->street != null) {
+                $a->street = strtoupper($a->street);
+            }
+            if ($a->city != ''|| $a->city != null) {
+                $a->city = strtoupper($a->city);
+            }
+            if ($a->state != ''|| $a->state != null) {
+                $a->state = strtoupper($a->state);
+            }
+                $a->save();
         }
 
         return "Done standardize city in DB";

routes/web.php

     return view('index');
 });
 
-Route::get('/update-promo-price', 'Controller@deleteTodayClaim');
+Route::get('/update-promo-price', 'Controller@updateAddress');
 
 Route::get('/convert-password/{action}/', ['uses' => 'Auth\AdminController@encryptPassword']);
 Route::get('/store-claim/pdf', ['uses' => 'DS\DealerController@exportDealerJson']);