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

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

Author: pre-commit-ci[bot]

data_structures/binary_tree/binary_search_tree.py

@@ -166,6 +166,7 @@ def empty(self) -> bool:
         False
         """
         return not self.root
+
     def __insert(self, value) -> None:
         """
         Insert a new node in Binary Search Tree with value label