v3.0

What's Changed

• Give users a way to find a task by searching for a keyword
• Add header comments to all files
• Split markOrUnmark() into two separate functions
• Adjust code so it adheres to coding standards

v2.0

This release is an improved version of the initial release v1.0, which seems to have gone missing for unknown reasons.
To compensate for the missing release, I am publishing this updated version.

The new update has more OOP.