[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

strings/longest_word_in_sentence.py

@@ -21,8 +21,10 @@ def longest_word(sentence: str) -> str:
     'thousand'
     """
     words = sentence.split()
-    return max(words, key=len) if words else ''
+    return max(words, key=len) if words else ""
+
 
 if __name__ == "__main__":
     from doctest import testmod
+
     testmod()