Fix Checkstyle NeedBraces and format NearestElement.java

Author: sgindeed

src/main/java/com/thealgorithms/stacks/NearestElement.java

@@ -13,7 +13,8 @@
  */
 public final class NearestElement {
     // Private constructor to prevent instantiation
-    private NearestElement() {}
+    private NearestElement() {
+    }
 
     /** Finds the nearest greater element to the right for each element in the array. */
     public static int[] nearestGreaterToRight(int[] arr) {
@@ -98,4 +99,4 @@ public static int[] nearestSmallerToLeft(int[] arr) {
 
         return result;
     }
-}
+}

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

@@ -58,4 +58,4 @@ void testNullInput() {
         assertThrows(IllegalArgumentException.class, () -> NearestElement.nearestSmallerToRight(null));
         assertThrows(IllegalArgumentException.class, () -> NearestElement.nearestSmallerToLeft(null));
     }
-}
+}