class Shell {

	String processReadLine(final String readLine) {
		String result = readLine.trim();
		if (!result.isEmpty()) {
			if (result.charAt(0) != '@') {
				result = "@" + result;
			}
			if (result.charAt(result.length() - 1) != '.') {
				result = result + " .";
			}
		}
		return result;
	}

	public  Shell(final Interpreter interpreter);

}