Feat: add new Markdown parser (#39800)

and change all the challenges to new `md` format.

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/kaprekar-numbers.md

@@ -5,60 +5,87 @@ challengeType: 5
 forumTopicId: 302296
 ---
 
-## Description
+# --description--
+
+A positive integer is a [Kaprekar number](<https://en.wikipedia.org/wiki/Kaprekar number>) if:
 
-<section id='description'>
-A positive integer is a <a href="https://en.wikipedia.org/wiki/Kaprekar number">Kaprekar number</a> if:
 <ul>
   <li>It is 1, or,</li>
   <li>The decimal representation of its square may be split once into two parts consisting of positive integers which sum to the original number. </li>
 </ul>
+
 Note that a split resulting in a part consisting purely of 0s is not valid, as 0 is not considered positive.Example
+
 Kaprekar numbers:
+
 <ul>
   <li><code>2223</code> is a Kaprekar number, as <code>2223 * 2223 = 4941729</code>, <code>4941729</code> may be split to <code>494</code> and <code>1729</code>, and <code>494 + 1729 = 2223</code></li>
-  <li>The series of Kaprekar numbers is known as <a href="https://oeis.org/A006886" target="_blank">A006886</a>, and begins as <code>1, 9, 45, 55, ...</code></li>
+  <li>The series of Kaprekar numbers is known as <a href='https://oeis.org/A006886' target='_blank'>A006886</a>, and begins as <code>1, 9, 45, 55, ...</code></li>
 </ul>
-</section>
 
-## Instructions
+# --instructions--
 
-<section id='instructions'>
 Write a function that takes a number $n$, a base $bs$, and returns true if the number is a Kaprekar number for the given base. Otherwise, the function returns false.
-</section>
 
-## Tests
+# --hints--
 
-<section id='tests'>
+`isKaprekar` should be a function.
 
-```yml
-tests:
-  - text: <code>isKaprekar</code> should be a function.
-    testString: assert(typeof isKaprekar == 'function');
-  - text: <code>isKaprekar(1, 10)</code> should return a boolean.
-    testString: assert(typeof isKaprekar(1, 10) == 'boolean');
-  - text: <code>isKaprekar(1, 10)</code> should return <code>true</code>.
-    testString: assert.equal(isKaprekar(1, 10), true);
-  - text: <code>isKaprekar(9, 10)</code> should return <code>true</code>.
-    testString: assert.equal(isKaprekar(9, 10), true);
-  - text: <code>isKaprekar(2223, 10)</code> should return <code>true</code>.
-    testString: assert.equal(isKaprekar(2223, 10), true);
-  - text: <code>isKaprekar(22823, 10)</code> should return <code>false</code>.
-    testString: assert.equal(isKaprekar(22823, 10), false);
-  - text: <code>isKaprekar(9, 17)</code> should return <code>false</code>.
-    testString: assert.equal(isKaprekar(9, 17), false);
-  - text: <code>isKaprekar(225, 17)</code> should return <code>true</code>.
-    testString: assert.equal(isKaprekar(225, 17), true);
-  - text: <code>isKaprekar(999, 17)</code> should return <code>false</code>.
-    testString: assert.equal(isKaprekar(999, 17), false);
+```js
+assert(typeof isKaprekar == 'function');
 ```
 
-</section>
+`isKaprekar(1, 10)` should return a boolean.
 
-## Challenge Seed
+```js
+assert(typeof isKaprekar(1, 10) == 'boolean');
+```
 
-<section id='challengeSeed'>
-  <div id='js-seed'>
+`isKaprekar(1, 10)` should return `true`.
+
+```js
+assert.equal(isKaprekar(1, 10), true);
+```
+
+`isKaprekar(9, 10)` should return `true`.
+
+```js
+assert.equal(isKaprekar(9, 10), true);
+```
+
+`isKaprekar(2223, 10)` should return `true`.
+
+```js
+assert.equal(isKaprekar(2223, 10), true);
+```
+
+`isKaprekar(22823, 10)` should return `false`.
+
+```js
+assert.equal(isKaprekar(22823, 10), false);
+```
+
+`isKaprekar(9, 17)` should return `false`.
+
+```js
+assert.equal(isKaprekar(9, 17), false);
+```
+
+`isKaprekar(225, 17)` should return `true`.
+
+```js
+assert.equal(isKaprekar(225, 17), true);
+```
+
+`isKaprekar(999, 17)` should return `false`.
+
+```js
+assert.equal(isKaprekar(999, 17), false);
+```
+
+# --seed--
+
+## --seed-contents--
 
 ```js
 function isKaprekar(n, bs) {
@@ -66,12 +93,7 @@ function isKaprekar(n, bs) {
 }
 ```
 
-  </div>
-</section>
-
-## Solution
-
-<section id='solution'>
+# --solutions--
 
 ```js
 function isKaprekar(n, bs) {
@@ -85,5 +107,3 @@ function isKaprekar(n, bs) {
   return false;
 }
 ```
-
-</section>