[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/linked_list/xor_linked_list.py

@@ -11,6 +11,7 @@
 >>> xor_list.to_list()
 [10, 20, 30]
 """
+
 from dataclasses import dataclass