fix: replace .english.md extension with .md

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/factors-of-an-integer.md

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+---
+title: Factors of an integer
+id: 597f1e7fbc206f0e9ba95dc4
+challengeType: 5
+forumTopicId: 302265
+---
+
+## Description
+<section id='description'>
+Write a function that returns the factors of a positive integer as an array.
+These factors are the positive integers by which the number being factored can be divided to yield a positive integer result.
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>factors</code> should be a function.
+    testString: assert(typeof factors === 'function');
+  - text: <code>factors(45)</code> should return <code>[1,3,5,9,15,45]</code>.
+    testString: assert.deepEqual(factors(45), ans[0]);
+  - text: <code>factors(53)</code> should return <code>[1,53]</code>.
+    testString: assert.deepEqual(factors(53), ans[1]);
+  - text: <code>factors(64)</code> should return <code>[1,2,4,8,16,32,64]</code>.
+    testString: assert.deepEqual(factors(64), ans[2]);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function factors(num) {
+
+}
+```
+
+</div>
+
+
+### After Test
+<div id='js-teardown'>
+
+```js
+const ans=[[1,3,5,9,15,45],[1,53],[1,2,4,8,16,32,64]];
+```
+
+</div>
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```js
+function factors(num)
+{
+ let n_factors = [], i, sqr=Math.floor(Math.sqrt(num));
+
+ for (i = 1; i <=sqr ; i += 1)
+  if (num % i === 0)
+  {
+   n_factors.push(i);
+   if (num / i !== i)
+    n_factors.push(num / i);
+  }
+ n_factors.sort(function(a, b){return a - b;});
+ return n_factors;
+}
+
+```
+
+</section>