style: enable HideUtilityClassConstructor in checkstyle (#5147)

src/main/java/com/thealgorithms/greedyalgorithms/ActivitySelection.java

@@ -6,7 +6,9 @@ import java.util.Comparator;
 
 // Problem Link:  https://en.wikipedia.org/wiki/Activity_selection_problem
 
-public class ActivitySelection {
+public final class ActivitySelection {
+    private ActivitySelection() {
+    }
     // Function to perform activity selection
     public static ArrayList<Integer> activitySelection(int[] startTimes, int[] endTimes) {
         int n = startTimes.length;

src/main/java/com/thealgorithms/greedyalgorithms/CoinChange.java

@@ -6,7 +6,9 @@ import java.util.Comparator;
 
 // Problem Link : https://en.wikipedia.org/wiki/Change-making_problem
 
-public class CoinChange {
+public final class CoinChange {
+    private CoinChange() {
+    }
     // Function to solve the coin change problem
     public static ArrayList<Integer> coinChangeProblem(int amount) {
         // Define an array of coin denominations in descending order

src/main/java/com/thealgorithms/greedyalgorithms/FractionalKnapsack.java

@@ -5,7 +5,9 @@ import java.util.Comparator;
 
 // Problem Link: https://en.wikipedia.org/wiki/Continuous_knapsack_problem
 
-public class FractionalKnapsack {
+public final class FractionalKnapsack {
+    private FractionalKnapsack() {
+    }
     // Function to perform fractional knapsack
     public static int fractionalKnapsack(int[] weight, int[] value, int capacity) {
         // Create a 2D array to store item indices and their value-to-weight ratios.

src/main/java/com/thealgorithms/greedyalgorithms/JobSequencing.java

@@ -5,7 +5,9 @@ import java.util.Arrays;
 
 // Problem Link: https://en.wikipedia.org/wiki/Job-shop_scheduling
 
-public class JobSequencing {
+public final class JobSequencing {
+    private JobSequencing() {
+    }
 
     // Define a Job class that implements Comparable for sorting by profit in descending order
     static class Job implements Comparable<Job> {

src/main/java/com/thealgorithms/greedyalgorithms/MinimizingLateness.java

@@ -2,7 +2,9 @@ package com.thealgorithms.greedyalgorithms;
 
 import java.util.Arrays;
 
-public class MinimizingLateness {
+public final class MinimizingLateness {
+    private MinimizingLateness() {
+    }
 
     public static class Job {
         String jobName;