style: include NAB_NEEDLESS_BOXING_PARSE

Author: vil02

spotbugs-exclude.xml

@@ -225,9 +225,6 @@
     <Match>
         <Bug pattern="ENMI_EQUALS_ON_ENUM" />
     </Match>
-    <Match>
-        <Bug pattern="NAB_NEEDLESS_BOXING_PARSE" />
-    </Match>
     <Match>
         <Bug pattern="IMC_IMMATURE_CLASS_VAR_NAME" />
     </Match>

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

@@ -34,7 +34,7 @@ public static boolean isHarshad(long n) {
      *         {@code false}
      */
     public static boolean isHarshad(String s) {
-        long n = Long.valueOf(s);
+        final Long n = Long.valueOf(s);
         if (n <= 0) return false;
 
         int sumOfDigits = 0;