Given a list of integers, write a function that returns the maximum number in the list. If the list is empty, return <code>None</code>.

Example 1:

Input:

<pre tabindex="0" class="chroma"><code>nums = [1, 7, 3, 5, 6]
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>find_max(nums) -&gt; 7
</code></pre>

Example 2:

Input:

<pre tabindex="0" class="chroma"><code>nums = []
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>find_max(nums) -&gt; None
</code></pre>

The task is to write a function that takes a list of integers as input and returns the maximum number in the list. If the list is empty, the function should return `None`.

Finding the Maximum Number in a List

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