style: enable HideUtilityClassConstructor in checkstyle (#5147)

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

@@ -16,7 +16,9 @@ import java.util.Stack;
  * @author <a href="https://github.com/khalil2535">khalil2535<a>
  * @author shellhub
  */
-class BalancedBrackets {
+final class BalancedBrackets {
+    private BalancedBrackets() {
+    }
 
     /**
      * Check if {@code leftBracket} and {@code rightBracket} is paired or not

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

@@ -2,7 +2,9 @@ package com.thealgorithms.stacks;
 
 import java.util.Stack;
 
-public class DecimalToAnyUsingStack {
+public final class DecimalToAnyUsingStack {
+    private DecimalToAnyUsingStack() {
+    }
 
     public static void main(String[] args) {
         assert convert(0, 2).equals("0");

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

@@ -11,7 +11,9 @@ package com.thealgorithms.stacks;
 import java.util.Scanner;
 import java.util.Stack;
 
-public class DuplicateBrackets {
+public final class DuplicateBrackets {
+    private DuplicateBrackets() {
+    }
 
     public static boolean check(String str) {
         Stack<Character> st = new Stack<>();

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

@@ -2,7 +2,9 @@ package com.thealgorithms.stacks;
 
 import java.util.Stack;
 
-public class InfixToPostfix {
+public final class InfixToPostfix {
+    private InfixToPostfix() {
+    }
 
     public static void main(String[] args) throws Exception {
         assert "32+".equals(infix2PostFix("3+2"));

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

@@ -7,7 +7,9 @@ import java.util.Stack;
  * @author mohd rameez github.com/rameez471
  */
 
-public class LargestRectangle {
+public final class LargestRectangle {
+    private LargestRectangle() {
+    }
 
     public static String largestRectanglehistogram(int[] heights) {
         int n = heights.length, maxArea = 0;

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

@@ -27,7 +27,9 @@ import java.util.Stack;
  *
  * @author sahil
  */
-public class MaximumMinimumWindow {
+public final class MaximumMinimumWindow {
+    private MaximumMinimumWindow() {
+    }
 
     /**
      * This function contains the logic of finding maximum of minimum for every

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

@@ -41,7 +41,9 @@ import java.util.Stack;
    -1.
  */
 
-public class NextGreaterElement {
+public final class NextGreaterElement {
+    private NextGreaterElement() {
+    }
 
     public static int[] findNextGreaterElements(int[] array) {
         if (array == null) {

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

@@ -37,7 +37,9 @@ import java.util.Stack;
    answer is -1
  */
 
-public class NextSmallerElement {
+public final class NextSmallerElement {
+    private NextSmallerElement() {
+    }
 
     public static int[] findNextSmallerElements(int[] array) {
         // base case

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

@@ -16,7 +16,9 @@ import java.util.Stack;
  *
  */
 
-public class PostfixToInfix {
+public final class PostfixToInfix {
+    private PostfixToInfix() {
+    }
 
     public static boolean isOperator(char token) {
         switch (token) {