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Prompt
Complete the following Python function: ```python from typing import List, Optional def longest(strings: List[str]) -> Optional[str]: """ Out of list of strings, return the longest one. Return the first one in case of multiple strings of the same length. Return None in case the input list is empty. >>> longest([]) >>> longest(['a', 'b', 'c']) 'a' >>> longest(['a', 'bb', 'ccc']) 'ccc' """ ```
Answer guidance
Canonical solution (function body): if not strings: return None maxlen = max(len(x) for x in strings) for s in strings: if len(s) == maxlen: return s
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