fix: replace .english.md extension with .md

curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-372-pencils-of-rays.md

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+---
+id: 5900f4e11000cf542c50fff3
+challengeType: 5
+title: 'Problem 372: Pencils of rays'
+forumTopicId: 302034
+---
+
+## Description
+<section id='description'>
+Let R(M, N) be the number of lattice points (x, y) which satisfy M<x≤N, M<y≤N and  is odd.
+We can verify that R(0, 100) = 3019 and R(100, 10000) = 29750422.
+Find R(2·106, 109).
+
+
+
+Note:  represents the floor function.
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>euler372()</code> should return 301450082318807040.
+    testString: assert.strictEqual(euler372(), 301450082318807040);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function euler372() {
+
+  return true;
+}
+
+euler372();
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+</section>