Q2

[Dilusha-Ranasingha]

consider converting an old-format NIC into a 12-digit EIC by:
Expanding year (YY → YYYY)
Inserting a fixed digit (0) at a known position
Why is it important that this transformation is reversible, and how would you design it to guarantee reversibility?

[imalkipinto]

Position Based Transformations

Insert or remove characters at fixed positions

No Information Loss

Never discard original digits(only expand/reform)

Explicit Reverse Function

Implement and test NIC → EIC and EIC → NIC as inverse functions.

Validation .

Validate structure and length before reversing to avoid corruption of outputs.