@@ -0,0 +1,589 @@
+package seedu.ezdo.logic.commands;%0A%0Aimport seedu.ezdo.logic.commands.exceptions.CommandException;%0A%0Apublic class UndoCommand extends Command %7B%0A    public static final String COMMAND_WORD = %22undo%22;%0A%0A    public static final String MESSAGE_USAGE = COMMAND_WORD + %22: Undo the previous undoable task.%22;%0A    public static final String MESSAGE_SUCCESS = %22Previous undoable task has been undone!%22;%0A    public static final String MESSAGE_NO_PREV_TASK = %22There is no previous undoable task!%22;%0A%0A    @Override%0A    public CommandResult execute() throws CommandException %7B%0A%0A        return null;%0A    %7D%0A%0A%7D%0A

Add UndoCommand.java