refactor: unified duplicate Anagram classes into a single implementation (#6290)

src/main/java/com/thealgorithms/maths/DudeneyNumber.java

@@ -1,11 +1,11 @@
+package com.thealgorithms.maths;
+
 /**
  * A number is said to be Dudeney if the sum of the digits, is the cube root of the entered number.
  * Example- Let the number be 512, its sum of digits is 5+1+2=8. The cube root of 512 is also 8.
  *          Since, the sum of the digits is equal to the cube root of the entered number;
  *          it is a Dudeney Number.
  */
-package com.thealgorithms.maths;
-
 public final class DudeneyNumber {
     private DudeneyNumber() {
     }