Fix

Author: Hardvan

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

@@ -8,7 +8,9 @@
  *
  * @author Hardvan
  */
-public class MinimumWaitingTime {
+public final class MinimumWaitingTime {
+    private MinimumWaitingTime() {
+    }
 
     /**
      * Calculates the minimum waiting time for a list of queries.