Refactored ReverseStringUsingStack utility for reversing strings using stack

Author: navaneedan07

src/main/java/com/thealgorithms/strings/ReverseString.java

@@ -85,4 +85,5 @@ public static String reverse4(String str) {
         }
         return reversedString.toString();
     }
+
 }

src/test/java/com/thealgorithms/stacks/ReverseStringUsingStackTest.java

@@ -41,5 +41,4 @@ void testWhitespaceHandling() {
     void testNullInput() {
         assertThrows(IllegalArgumentException.class, () -> { ReverseStringUsingStack.reverse(null); });
     }
-    
 }