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

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

Author: pre-commit-ci[bot]

Diff for: maths/base_neg2_conversion.py

@@ -36,4 +36,5 @@ def decimal_to_negative_base_2(num: int) -> int:
 
 if __name__ == "__main__":
     import doctest
+
     doctest.testmod()