…y them back to the user when requested

Ui: deals with interactions with the user
Storage: deals with loading tasks from the
file and saving tasks in the file
Parser: deals with making sense of the user
command
TaskList: contains the task list e.g., it
has operations to add/delete tasks in the list
Command: contains all commands

Current Duke codebase has many implicit assumptions
about the Internal Invariants and Control-Flow Invariants.

Unverified assumptions may cause bugs to be undiscovered
during development and cause issues for the user
in production.

Let's add assertions throughout the codebase to verify
these assumptions.

Thorough checking of assumptions using assertions can
ensure that bugs in the code are discovered quickly.

Current code has areas of improvement with regards
to readability and code duplication.

Poor readability would make the code less
maintainable and comprehensable to others. Code
duplication may lead to greater effort to
adjust duplicated code in future.

Implemenented SLAP, abstracted more logic to make
code at each level simpler, removed duplicated
code.

SLAP, abstractions and DRY principle makes code
more readable and improves code quality.

Add Assert feature

Improve code quality

Implement undo command

…a file