[REFACTOR] [Hacker Rank] Interview Preparation Kit: Array: 2D Array - DS.

Adjusted the interface to match what hackerrank expects. Standarized way.

Author: sir-gon

src/hackerrank/interview_preparation_kit/arrays/2d_array.js

@@ -58,3 +58,4 @@ function hourglassSum(arr) {
 }
 
 export default { hourglassSum };
+export { hourglassSum };

src/hackerrank/interview_preparation_kit/arrays/2d_array.test.js

@@ -1,15 +1,15 @@
 import { describe, expect, it } from '@jest/globals';
 import { logger as console } from '../../../logger.js';
 
-import twoDArray from './2d_array.js';
+import { hourglassSum } from './2d_array.js';
 import TEST_CASES from './2d_array.testcases_test.json';
 
 describe('arrays: 2d Array hourglassSum', () => {
   it('hourglassSum Test Cases', () => {
     expect.assertions(3);
 
     TEST_CASES.forEach((test) => {
-      const answer = twoDArray.hourglassSum(test.input);
+      const answer = hourglassSum(test.input);
 
       console.debug(
         `gethourGlass(${test.input.toString()}) solution found: ${answer}`