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

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

Author: pre-commit-ci[bot]

dynamic_programming/longest_common_subsequence.py

@@ -48,6 +48,7 @@ def longest_common_subsequence_string(u: str, v: str) -> str:
 
     return "".join(reversed(lcs))
 
+
 if __name__ == "__main__":
     a = "AGGTAB"
     b = "GXTXAYB"
@@ -58,4 +59,5 @@ def longest_common_subsequence_string(u: str, v: str) -> str:
     assert subseq == expected_subseq
 
     import doctest
+
     doctest.testmod()