Directory.md

[Shashwat79802]

Updated the Directory.md file, and added all the recently added programs to both main and test package.

[siriak]

Looks good, thanks!

[Shashwat79802]

Will I not get the Hacktoberfest-accepted tag for this one?

[siriak]

The repository itself is tagged for hacktoberfest, so PR tag is redundant as I understand

[JYOTI73]

package com.thealgorithms.datastructures.heaps;

/*

• @author Nicolas Renard Exception to be thrown if the getElement method is

• used on an empty heap.
  */
  @SuppressWarnings("serial")
  public class EmptyHeapException extends Exception {

  public EmptyHeapException(String message) {
  super(message);
  }
  }