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

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

Author: pre-commit-ci[bot]

strings/split.py

@@ -50,4 +50,4 @@ def split(string: str, separator: str = " ") -> list:
 if __name__ == "__main__":
     from doctest import testmod
 
-    testmod()
+    testmod()