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

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

backtracking/generate_parentheses.py

@@ -64,7 +64,7 @@ def generate_parenthesis(n: int) -> list[str]:
     Example 2:
     >>> generate_parenthesis(1)
     ['()']
-    
+
     Example 3:
     >>> generate_parenthesis(0)
     ['']

backtracking/word_break.py

@@ -66,7 +66,7 @@ def word_break(input_string: str, word_dict: set[str]) -> bool:
 
     >>> word_break("catsandog", {"cats", "dog", "sand", "and", "cat"})
     False
-    
+
     >>> word_break("applepenapple", {})
     False
     """