@@ -0,0 +1,537 @@
+package seedu.taskitty.logic.commands;%0A%0Apublic class UndoCommand extends Command %7B%0A    %0A    public static final String COMMAND_WORD = %22undo%22;%0A%0A    public static final String MESSAGE_USAGE = COMMAND_WORD%0A            + %22: Undos the previous action%5Cn%22%0A            + %22Example: %22 + COMMAND_WORD;%0A%0A    private static final String MESSAGE_UNDO_TASK_SUCCESS = %22Undoed previous action%22;%0A    %0A    public UndoCommand() %7B%7D%0A    %0A    @Override%0A    public CommandResult execute() %7B%0A        return new CommandResult(MESSAGE_UNDO_TASK_SUCCESS);%0A    %7D%0A%0A%7D%0A

Add new class UndoCommand