added trim for each detected class for classTag helper

src/HtmlHelper.php

@@ -42,7 +42,7 @@ class HtmlHelper implements Htmlable
                                         . gettype($arg) . ' type given for « ' . $arg . ' » argument.');
             }
         }
-
+        $classArray = array_map('trim', $classArray);
         $this->htmlString = new HtmlString('class="' . implode(' ', $classArray) . '"');
 
         return $this;

tests/Unit/ClassTagTest.php

@@ -15,7 +15,7 @@ class ClassTagTest extends HtmlhelperTestCase
             'class1',
             ['class2', 'class3', null],
             null,
-            ['class4', ['class5', 'class6Key' => 'class6']],
+            ['class4', ['class5 ', 'class6Key' => 'class6']],
             7
         );
         $this->assertEquals('class="class1 class2 class3 class4 class5 class6 7"', $html);
@@ -27,7 +27,7 @@ class ClassTagTest extends HtmlhelperTestCase
             'class1',
             ['class2', 'class3', null],
             null,
-            ['class4', ['class5', 'class6Key' => 'class6']],
+            ['class4', ['class5 ', 'class6Key' => 'class6']],
             7
         )->render();
         $this->assertEquals('class="class1 class2 class3 class4 class5 class6 7"', $html);