fix: replace .english.md extension with .md

curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-388-distinct-lines.md

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+---
+id: 5900f4f11000cf542c510002
+challengeType: 5
+title: 'Problem 388: Distinct Lines'
+forumTopicId: 302052
+---
+
+## Description
+<section id='description'>
+Consider all lattice points (a,b,c) with 0 ≤ a,b,c ≤ N.
+
+
+From the origin O(0,0,0) all lines are drawn to the other lattice points.
+Let D(N) be the number of distinct such lines.
+
+
+You are given that D(1 000 000) = 831909254469114121.
+
+Find D(1010). Give as your answer the first nine digits followed by the last nine digits.
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>euler388()</code> should return 831907372805130000.
+    testString: assert.strictEqual(euler388(), 831907372805130000);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function euler388() {
+
+  return true;
+}
+
+euler388();
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+</section>