Task: Implement a Default-Value Dictionary in C
Task: Implement a Default-Value Dictionary in C: a task in Terminal-Lego-15k (Harbor dataset). Create a custom dictionary implementation in C that returns a default value instead of throwing a KeyNotFoundException when accessing a missing key via the indexer.
The task
Create a custom dictionary implementation in C# that returns a default value instead of throwing a `KeyNotFoundException` when accessing a missing key via the indexer.
Part of PrimeIntellect/Terminal-Lego-15k.