Sure! The `injectCode` function uses JavaScript's `fetch` API to make a GET request to the specified API endpoint. The response from the endpoint is then retrieved as plain text using the `text()` method. A new `script` element is then created, and its `innerHTML` property is set to the response data. Finally, the script element is appended to the `body` of the current document, and the injected code is executed.

Here's an example of how to use the `injectCode` function with an API endpoint:

```rust
injectCode('https://example.com/api/script.js');
```

In this example, the function is called with the URL of a JavaScript file located at `https://example.com/api/script.js`. The code in the file will be retrieved and injected into the current page, where it will be executed.

Note that the `injectCode` function assumes that the response from the API is valid JavaScript code that can be safely executed in the context of the current page. You should exercise caution when using this function with APIs that you do not control, as injecting untrusted code into a web page can be a security risk.
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