Parse an access log status code

Challenge

Implement int log_status_code(const char *line) that, given a Common Log Format line such as

127.0.0.1 - frank [10/Oct/2000:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326

returns the HTTP status code (the integer after the closing " of the request). Return -1 on a malformed line.

Starter code

int log_status_code(const char *line) {
    /* TODO */
    return -1;
}