diff --git a/backtracking/combination_sum.py b/backtracking/combination_sum.py
index afcb7fb33..91d765973 100644
--- a/backtracking/combination_sum.py
+++ b/backtracking/combination_sum.py
@@ -60,7 +60,6 @@ def combination_sum(candidates: list, target: int) -> list:
 
     if any(x < 0 for x in candidates):
         raise ValueError("All elements in candidates must be non-negative.")
-    
     backtrack(candidates, path, answer, target, 0)
     return answer