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Quick Summary

Implement a RecipeManager class supporting Create, Read, Update, and Delete operations.
Enforce unique recipe names across all entries using case-insensitive comparison.
Assign sequential, non-reusable recipe IDs starting from 'recipe1'.

What This Tests

Hash Map usage for O(1) lookups by ID and name.
Handling case-insensitive string logic and normalization.
Managing internal state, counters, and ID lifecycle.
Designing robust methods with specific edge-case requirements.

Common Patterns

Hashing

Design

Test Cases

Input

Output

Expected