Command Executor with Execute and Undo

Problem: Implement a Command Executor with execute and undo Implement a CommandExecutor that can execute commands in order and undo the most recently executed command. Each Command must support: apply(): performs the command and mutates the system state revert(): undoes the command and restores the state to what it was before apply() You must implement: execute(command): execute a command and record it in undo history undo(): undo the most recent successfully executed and not-yet-undone command Requirements Define behavior when undo() is called with no history (return False / raise / no-op). If execute() fails (e.g., apply() raises), the command must NOT be recorded. Provide a small demo: e.g., an integer state with Add(x) commands. Constraints Over N operations, total overhead should be O(N). Each execute/undo should be amortized O(1) excluding the command logic. Example Tests input: # initial state = 0 execute Add(5) execute Add(3) undo undo undo output: state=5 state=8 state=5 state=0 False input: # initial state = 10 execute Add(-2) undo output: state=8 state=10 Example Input # initial state = 0 execute Add(5) execute Add(3) undo undo undo Output state=5 state=8 state=5 state=0 False