style: enable NoWhitespaceAfter in checkstyle

checkstyle.xml

@@ -137,7 +137,7 @@
     <module name="EmptyForIteratorPad"/>
     <!-- TODO <module name="GenericWhitespace"/> -->
     <module name="MethodParamPad"/>
-    <!-- TODO <module name="NoWhitespaceAfter"/> -->
+    <module name="NoWhitespaceAfter"/>
     <module name="NoWhitespaceBefore"/>
     <module name="OperatorWrap"/>
     <module name="ParenPad"/>

src/main/java/com/thealgorithms/datastructures/graphs/WelshPowell.java

@@ -98,7 +98,7 @@ private static int[] initializeColors(int numberOfVertices) {
     }
 
     private static Integer[] getSortedNodes(final Graph graph) {
-        return IntStream.range(0, graph.getNumVertices()).boxed().sorted(Comparator.comparingInt(v -> - graph.getAdjacencyList(v).size())).toArray(Integer[] ::new);
+        return IntStream.range(0, graph.getNumVertices()).boxed().sorted(Comparator.comparingInt(v -> -graph.getAdjacencyList(v).size())).toArray(Integer[] ::new);
     }
 
     private static boolean[] computeUsedColors(final Graph graph, final int vertex, final int[] colors) {

src/main/java/com/thealgorithms/scheduling/PreemptivePriorityScheduling.java

@@ -29,7 +29,7 @@ private PreemptivePriorityScheduling() {
     }
     public static List<String> preemptivePriorityScheduling(List<Process> processes) {
         List<String> ganttChart = new ArrayList<>();
-        PriorityQueue<Process> readyQueue = new PriorityQueue<>(Comparator.comparingInt(p -> - p.priority));
+        PriorityQueue<Process> readyQueue = new PriorityQueue<>(Comparator.comparingInt(p -> -p.priority));
 
         int currentTime = 0;