Added minimum window substring implementation and test file with prettier code

Author: Mayank29903

Maths/MobiusFunction.js

@@ -28,6 +28,6 @@ export const mobiusFunction = (number) => {
   return primeFactorsArray.length !== new Set(primeFactorsArray).size
     ? 0
     : primeFactorsArray.length % 2 === 0
-    ? 1
-    : -1
+      ? 1
+      : -1
 }

Sliding-Windows/MinimumWindowSubstring.js

@@ -5,7 +5,7 @@
  */
 
 function minWindowSubstring(s, t) {
-  if (t.length > s.length) return ""
+  if (t.length > s.length) return ''
 
   const need = {}
   for (let char of t) {
@@ -36,7 +36,7 @@ function minWindowSubstring(s, t) {
     }
   }
 
-  return minLen === Infinity ? "" : s.substring(minStart, minStart + minLen)
+  return minLen === Infinity ? '' : s.substring(minStart, minStart + minLen)
 }
 
 export { minWindowSubstring }

Sliding-Windows/test/MinimumWindowSubstring.test.js

@@ -2,16 +2,16 @@
  * Test file for Minimum Window Substring
  */
 
-import { minWindowSubstring } from "../MinimumWindowSubstring.js"
+import { minWindowSubstring } from '../MinimumWindowSubstring.js'
 
-test("return smallest window containing all characters", () => {
-  expect(minWindowSubstring("ADOBECODEBANC", "ABC")).toBe("BANC")
+test('return smallest window containing all characters', () => {
+  expect(minWindowSubstring('ADOBECODEBANC', 'ABC')).toBe('BANC')
 })
 
-test("return empty string if no window found", () => {
-  expect(minWindowSubstring("HELLO", "XYZ")).toBe("")
+test('return empty string if no window found', () => {
+  expect(minWindowSubstring('HELLO', 'XYZ')).toBe('')
 })
 
-test("return full string if it matches exactly", () => {
-  expect(minWindowSubstring("ABC", "ABC")).toBe("ABC")
+test('return full string if it matches exactly', () => {
+  expect(minWindowSubstring('ABC', 'ABC')).toBe('ABC')
 })