[prac2] Regression detected in pracs/prac2/students/2/mutated.c

This module began failing tests at commit 0b99432.

The last known good commit is f198a37, which gives the following test output:

```
connect() to port failed: Connection refused
Port 45928 is available for use by student programme.
connect() to port failed: Connection refused
SUCCESS: Accepts connections on specified TCP port
FAIL: Accepting multiple connections on a TCP port. Did not complete 1,000 connections in less than 5 minutes.
SUCCESS: Accepted 1,000 connections in less than a minute.
SUCCESS: HTTP request 'GET / HTTP/1.0\r\n\r\n' returned HTTP response code 200
SUCCESS: HTTP request 'GET / HTTP/1.0\r\r' returned HTTP response code 200

The HTTP request does not end in two carriage returns. Waiting for timeout...
SUCCESS: HTTP request 'GET / HTTP/1.0' returned nothing, a dropped connection or HTTP request timeout indication.

The HTTP request does not end in two carriage returns. Waiting for timeout...
SUCCESS: HTTP request 'GET / HTTP/1.0\r\n' returned nothing, a dropped connection or HTTP request timeout indication.

The client has requested FTP. Sending error.
SUCCESS: HTTP request 'GET / FTP/1.0\r\n\r\n' correctly reported an HTTP error

The client has requested the wrong version of HTTP. Sending error.
SUCCESS: HTTP request 'GET / HTTP/1.1\r\n\r\n' correctly reported an HTTP error

The client has requested a page. Reporting a 404 error.

The page request does not end in two carriage returns. Waiting for timeout...
SUCCESS: HTTP request 'GET /this_page_should_not_exist HTTP/1.0\r\n\r\n' returned HTTP response code 404
SUCCESS: Response includes valid and correct content-length field
SUCCESS: Makes outbound TCP connection on specified port.
SUCCESS: Wrote to outbound TCP connection.
SUCCESS: Wrote a valid HTTP request to outbound TCP connection.
SUCCESS: Wrote valid HTTP request to /gettoken to retrieve token.
SUCCESS: Did write response for token challenge request.
SUCCESS: Did return an HTTP error code 5xx when token fetching fails.
SUCCESS: Makes outbound TCP connection on specified port.
SUCCESS: Wrote to outbound TCP connection.
SUCCESS: Wrote a valid HTTP request to outbound TCP connection.
SUCCESS: Wrote valid HTTP request to /gettoken to retrieve token.
SUCCESS: Did write response for token challenge request.
SUCCESS: Returned a HTTP 200 OK response to token challenge request.
SUCCESS: Returned a valid HTTP body and/or content-length header to token     challenge request.
SUCCESS: Returned token from token challenge request.
Passed 24 of 25 tests.
Score for functional aspects of assignment 1 will be 80%.
Score for style (0% -- 16%) will be assessed manually.
Therefore your grade for this assignment will be in the range 80% -- 96% (DN -- HD)
About to kill student process 25031
Seeing how that went.
```

As can be observed, 24 of 25 tests pass (the 25 test is not applicable to this practical exercise).

In contrast, commit 0b99432 passes only 22 out of 25 tests:

```
connect() to port failed: Connection refused
Port 39307 is available for use by student programme.
connect() to port failed: Connection refused
SUCCESS: Accepts connections on specified TCP port
FAIL: Accepting multiple connections on a TCP port. Did not complete 1,000 connections in less than 5 minutes.
SUCCESS: Accepted 1,000 connections in less than a minute.
SUCCESS: HTTP request 'GET / HTTP/1.0\r\n\r\n' returned HTTP response code 200
SUCCESS: HTTP request 'GET / HTTP/1.0\r\r' returned HTTP response code 200

The HTTP request does not end in two carriage returns. Waiting for timeout...
SUCCESS: HTTP request 'GET / HTTP/1.0' returned nothing, a dropped connection or HTTP request timeout indication.

The HTTP request does not end in two carriage returns. Waiting for timeout...
SUCCESS: HTTP request 'GET / HTTP/1.0\r\n' returned nothing, a dropped connection or HTTP request timeout indication.

The client has requested FTP. Sending error.
SUCCESS: HTTP request 'GET / FTP/1.0\r\n\r\n' correctly reported an HTTP error

The client has requested the wrong version of HTTP. Sending error.
SUCCESS: HTTP request 'GET / HTTP/1.1\r\n\r\n' correctly reported an HTTP error

The client has requested a page. Reporting a 404 error.

The page request does not end in two carriage returns. Waiting for timeout...
SUCCESS: HTTP request 'GET /this_page_should_not_exist HTTP/1.0\r\n\r\n' returned HTTP response code 404
SUCCESS: Response includes valid and correct content-length field
SUCCESS: Makes outbound TCP connection on specified port.
SUCCESS: Wrote to outbound TCP connection.
SUCCESS: Wrote a valid HTTP request to outbound TCP connection.
SUCCESS: Wrote valid HTTP request to /gettoken to retrieve token.
SUCCESS: Did write response for token challenge request.
SUCCESS: Did return an HTTP error code 5xx when token fetching fails.
SUCCESS: Makes outbound TCP connection on specified port.
SUCCESS: Wrote to outbound TCP connection.
SUCCESS: Wrote a valid HTTP request to outbound TCP connection.
SUCCESS: Wrote valid HTTP request to /gettoken to retrieve token.
SUCCESS: Did write response for token challenge request.
SUCCESS: Returned a HTTP 200 OK response to token challenge request.
FAIL: Did not return a valid HTTP body and/or content-length header to token challenge request.
FAIL: Failed to return token from token challenge request.
Passed 22 of 25 tests.
Score for functional aspects of assignment 1 will be 73%.
Score for style (0% -- 16%) will be assessed manually.
Therefore your grade for this assignment will be in the range 73% -- 89% (CR -- HD)
About to kill student process 20711
Seeing how that went.
```