The function injects code into the page by:

Making a Fetch API request to the specified API URL
Retrieving the response as text (assuming it's plain text JavaScript code)
Creating a new <script> element
Setting the element's innerHTML to the response text (containing the JavaScript code)
Appending the <script> element to the document <body>

This has the effect of executing the JavaScript code contained in the response, injecting it into the page.
For example, you could call the function like this:
injectCode('https://example.com/api/getScript%27);

And the function would make a request to that URL, retrieve the response, and inject/execute any JavaScript code in the response.
So essentially it allows dynamically injecting/executing JavaScript from an external API into the current page.
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