ACP2E-2428: Coupon code whitespace issue in checkout page

- static issues

Author: aplapana

app/code/Magento/Quote/Model/GuestCart/GuestCouponManagement.php

@@ -41,7 +41,7 @@ public function __construct(
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function get($cartId)
     {
@@ -51,7 +51,7 @@ public function get($cartId)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function set($cartId, $couponCode)
     {
@@ -61,7 +61,7 @@ public function set($cartId, $couponCode)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function remove($cartId)
     {

app/code/Magento/SalesRule/view/frontend/web/js/view/payment/discount.js

@@ -59,10 +59,12 @@ define([
          * @returns {Boolean}
          */
         validate: function () {
-            var form = '#discount-form';
-            $(form + " input[type='text']").each(function () {
-                $(this).val($(this).val().trim());
-            })
+            let form = '#discount-form';
+
+            $(form + ' input[type="text"]').each(function () {
+                let currentValue = $(this).val();
+                $(this).val(currentValue.trim());
+            });
             return $(form).validation() && $(form).validation('isValid');
         }
     });