diff --git a/backtracking/generate_parentheses.py b/backtracking/generate_parentheses.py
index fbef9f4ac..5094f4b08 100644
--- a/backtracking/generate_parentheses.py
+++ b/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)
     ['']
diff --git a/backtracking/word_break.py b/backtracking/word_break.py
index 2215911b9..2e874a02b 100644
--- a/backtracking/word_break.py
+++ b/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
     """