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Quick Summary

Identify the earliest starting position of any stop word within a target string.
Extract and return the substring that precedes that specific position.
Handle edge cases such as missing matches, leading matches, and multiple overlapping candidates.

What This Tests

Fundamental string searching and pattern matching
Index tracking and state comparison across multiple inputs
Edge case handling in sequence processing
Understanding time complexity tradeoffs between naive and optimized approaches

Common Patterns

String Searching

Test Cases

Input

Output

Expected