style: enable WhitespaceAround in checktyle (TheAlgorithms#5241)

Author: vil02

checkstyle.xml

@@ -143,7 +143,7 @@
     <module name="ParenPad"/>
     <module name="TypecastParenPad"/>
     <module name="WhitespaceAfter"/>
-    <!-- TODO <module name="WhitespaceAround"/> -->
+    <module name="WhitespaceAround"/>
 
     <!-- Modifier Checks                                    -->
     <!-- See https://checkstyle.org/checks/modifier/index.html -->

src/main/java/com/thealgorithms/dynamicprogramming/UniquePaths.java

@@ -19,7 +19,8 @@
 
 public final class UniquePaths {
 
-    private UniquePaths(){};
+    private UniquePaths() {
+    }
 
     /**
      * Calculates the number of unique paths using a 1D dynamic programming array.

src/test/java/com/thealgorithms/maths/MeansTest.java

@@ -59,7 +59,7 @@ void arithmeticMeanMultipleNumbers() {
 
     @Test
     void geometricMeanMultipleNumbers() {
-        LinkedList<Double> numbers = new LinkedList<>() {};
+        LinkedList<Double> numbers = new LinkedList<>();
         numbers.addAll(Lists.newArrayList(1d, 2d, 3d, 4d, 5d, 6d, 1.25));
         assertEquals(2.6426195539300585, Means.geometric(numbers));
     }