I would consider this contribution to be of moderate-high difficulty.
One major difficulty of implementing the add feature was that it was tightly coupled with many other components of the application.
add feature to support creating gamer contacts with a required gamertag and multiple optional gamer-specific fields.AddCommandParser so the add command could correctly parse user input and reject malformed commands.Gamer model and related classes to support the expanded set of contact details.One key challenge was input validation. The application had to reject invalid values while still remaining user-friendly. This was especially relevant for phone numbers, where I worked on stricter validation rules and clearer error reporting rather than relying on only a basic format check. Handling edge cases properly was important so that invalid inputs would fail predictably and informatively.