[REFACTOR] [Hacker Rank] Interview Preparation Kit: Arrays: Minimum Swaps 2.

* Adjusted the interface to match what hackerrank expects.

Author: Gonzalo Diaz

src/hackerrank/interview_preparation_kit/recursion_and_backtracking/recursive_digit_sum.js

@@ -17,7 +17,7 @@ export function superDigitCompute(n) {
   return superDigitCompute(`${partial}`);
 }
 
-export function superDigit(n, k) {
+function superDigit(n, k) {
   const accumulator = `${superDigitCompute(n)}`;
 
   let result = '';