fix(challenge-md): Fix file names and preserve challenge order in meta.json

curriculum/challenges/en/08-coding-interview-prep/project-euler/problem-326-modulo-summations.en.md

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+---
+id: 5900f4b21000cf542c50ffc5
+challengeType: 5
+title: 'Problem 326: Modulo Summations'
+---
+
+## Description
+<section id='description'>
+Let an be a sequence recursively defined by: . 
+
+
+So the first 10 elements of an are: 1,1,0,3,0,3,5,4,1,9.
+
+Let f(N,M) represent the number of pairs (p,q) such that: 
+
+
+It can be seen that f(10,10)=4 with the pairs (3,3), (5,5), (7,9) and (9,10).
+
+
+You are also given that f(104,103)=97158.
+
+Find f(1012,106).
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+- text: <code>euler326()</code> should return 1966666166408794400.
+  testString: 'assert.strictEqual(euler326(), 1966666166408794400, ''<code>euler326()</code> should return 1966666166408794400.'');'
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function euler326() {
+  // Good luck!
+  return true;
+}
+
+euler326();
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+</section>