Feat: add new Markdown parser (#39800)

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

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/stream-merge.md

@@ -5,49 +5,102 @@ challengeType: 5
 forumTopicId: 302326
 ---
 
-## Description
-
-<section id='description'>
+# --description--
 
 Write a function that takes multiple sorted arrays of items, and returns one array of sorted items.
 
-</section>
+# --hints--
 
-## Instructions
+`mergeLists` should be a function.
 
-<section id='instructions'>
-
-</section>
-
-## Tests
-
-<section id='tests'>
-
-```yml
-tests:
-  - text: <code>mergeLists</code> should be a function.
-    testString: assert(typeof mergeLists == 'function');
-  - text: <code>mergeLists([[1, 3, 5, 9, 10], [2, 4, 6, 7, 8]])</code> should return an array.
-    testString: assert(Array.isArray(mergeLists([[1, 3, 5, 9, 10], [2, 4, 6, 7, 8]])));
-  - text: <code>mergeLists([[1, 3, 5, 9, 10], [2, 4, 6, 7, 8]])</code> should return <code>[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]</code>.
-    testString: assert.deepEqual(mergeLists([[1, 3, 5, 9, 10], [2, 4, 6, 7, 8]]), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
-  - text: <code>mergeLists([[1, 4, 7, 10], [2, 5, 8, 11], [3, 6, 9, 12]])</code> should return <code>[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]</code>.
-    testString: assert.deepEqual(mergeLists([[1, 4, 7, 10], [2, 5, 8, 11], [3, 6, 9, 12]]), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]);
-  - text: <code>mergeLists([[1, 3, 9, 14, 15, 17, 28], [7, 8, 14, 14, 23, 26, 28, 29, 30], [9, 23, 25, 29]])</code> should return <code>[1, 3, 7, 8, 9, 9, 14, 14, 14, 15, 17, 23, 23, 25, 26, 28, 28, 29, 29, 30]</code>.
-    testString: assert.deepEqual(mergeLists([[1, 3, 9, 14, 15, 17, 28], [7, 8, 14, 14, 23, 26, 28, 29, 30], [9, 23, 25, 29]]), [1, 3, 7, 8, 9, 9, 14, 14, 14, 15, 17, 23, 23, 25, 26, 28, 28, 29, 29, 30]);
-  - text: <code>mergeLists([[3, 14, 15], [2, 17, 18], [], [2, 3, 5, 7]])</code> should return <code>[2, 2, 3, 3, 5, 7, 14, 15, 17, 18]</code>.
-    testString: assert.deepEqual(mergeLists([[3, 14, 15], [2, 17, 18], [], [2, 3, 5, 7]]), [2, 2, 3, 3, 5, 7, 14, 15, 17, 18]);
-  - text: <code>mergeLists([[1, 19, 1999], [17, 33, 2999, 3000], [8, 500, 3999]])</code> should return <code>[1, 8, 17, 19, 33, 500, 1999, 2999, 3000, 3999]</code>.
-    testString: assert.deepEqual(mergeLists([[1, 19, 1999], [17, 33, 2999, 3000], [8, 500, 3999]]), [1, 8, 17, 19, 33, 500, 1999, 2999, 3000, 3999]);
+```js
+assert(typeof mergeLists == 'function');
 ```
 
-</section>
+`mergeLists([[1, 3, 5, 9, 10], [2, 4, 6, 7, 8]])` should return an array.
 
-## Challenge Seed
+```js
+assert(
+  Array.isArray(
+    mergeLists([
+      [1, 3, 5, 9, 10],
+      [2, 4, 6, 7, 8]
+    ])
+  )
+);
+```
 
-<section id='challengeSeed'>
+`mergeLists([[1, 3, 5, 9, 10], [2, 4, 6, 7, 8]])` should return `[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]`.
 
-<div id='js-seed'>
+```js
+assert.deepEqual(
+  mergeLists([
+    [1, 3, 5, 9, 10],
+    [2, 4, 6, 7, 8]
+  ]),
+  [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+);
+```
+
+`mergeLists([[1, 4, 7, 10], [2, 5, 8, 11], [3, 6, 9, 12]])` should return `[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]`.
+
+```js
+assert.deepEqual(
+  mergeLists([
+    [1, 4, 7, 10],
+    [2, 5, 8, 11],
+    [3, 6, 9, 12]
+  ]),
+  [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
+);
+```
+
+`mergeLists([[1, 3, 9, 14, 15, 17, 28], [7, 8, 14, 14, 23, 26, 28, 29, 30], [9, 23, 25, 29]])` should return `[1, 3, 7, 8, 9, 9, 14, 14, 14, 15, 17, 23, 23, 25, 26, 28, 28, 29, 29, 30]`.
+
+```js
+assert.deepEqual(
+  mergeLists([
+    [1, 3, 9, 14, 15, 17, 28],
+    [7, 8, 14, 14, 23, 26, 28, 29, 30],
+    [9, 23, 25, 29]
+  ]),
+  [1, 3, 7, 8, 9, 9, 14, 14, 14, 15, 17, 23, 23, 25, 26, 28, 28, 29, 29, 30]
+);
+```
+
+`mergeLists([[3, 14, 15], [2, 17, 18], [], [2, 3, 5, 7]])` should return `[2, 2, 3, 3, 5, 7, 14, 15, 17, 18]`.
+
+```js
+assert.deepEqual(mergeLists([[3, 14, 15], [2, 17, 18], [], [2, 3, 5, 7]]), [
+  2,
+  2,
+  3,
+  3,
+  5,
+  7,
+  14,
+  15,
+  17,
+  18
+]);
+```
+
+`mergeLists([[1, 19, 1999], [17, 33, 2999, 3000], [8, 500, 3999]])` should return `[1, 8, 17, 19, 33, 500, 1999, 2999, 3000, 3999]`.
+
+```js
+assert.deepEqual(
+  mergeLists([
+    [1, 19, 1999],
+    [17, 33, 2999, 3000],
+    [8, 500, 3999]
+  ]),
+  [1, 8, 17, 19, 33, 500, 1999, 2999, 3000, 3999]
+);
+```
+
+# --seed--
+
+## --seed-contents--
 
 ```js
 function mergeLists(lists) {
@@ -55,12 +108,7 @@ function mergeLists(lists) {
 }
 ```
 
-</div>
-</section>
-
-## Solution
-
-<section id='solution'>
+# --solutions--
 
 ```js
 function mergeLists(lists) {
@@ -89,5 +137,3 @@ function mergeLists(lists) {
   return result;
 }
 ```
-
-</section>