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Quick Summary

Parse a comma-separated skill string and filter it against a required skills list.
Preserve the applicant's original skill order while ensuring each match appears only once.
Handle whitespace trimming and enforce exact case-sensitive matching.

What This Tests

String tokenization and normalization
Efficient membership testing via hashing
Order-preserving iteration and deduplication
Edge case management (empty inputs, trailing spaces)

Common Patterns

Hashing

Test Cases

Input

Output

Expected