Managing files

You are developing a mail service. It is expected to have a method for moving messages into the spam directory. Here it is:

1  public void moveToSpam(String username, File msg) {
2      String pathToSpam = username + File.separator + "spam";
3
4      File spamDirectory = new File(pathToSpam);
5      if (!spamDirectory.exists()) {
6          spamDirectory.mkdir();
7      }
8
9      File spamMsg = new File(pathToSpam + File.separator + msg.getName());
10     __;
11 }

The method checks that ${username}/spam directory exists and then moves the specified file into it.

• username directory is a home directory for a user account;
• spam directory is a directory where spam messages go. It may not exist yet.

After the method's completion spam message should be in ${username}/spam.

Fill the gap in the 10th line to make the method work properly.