[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/add_node.py

@@ -3,6 +3,7 @@ def __init__(self, data: int) -> None:
         self.data = data
         self.ref = None
 
+
 class LinkedList:
     def __init__(self) -> None:
         self.head = None
@@ -76,10 +77,12 @@ def add_after(self, data: int, target_value: int) -> None:
         new_node = Node(data)
         new_node.ref = n.ref
         n.ref = new_node
-linked_list= LinkedList()
+
+
+linked_list = LinkedList()
 linked_list.add_begin(11)
 linked_list.add_end(100)
 linked_list.add_begin(22)
-linked_list.add_after(30,11)
+linked_list.add_after(30, 11)
 linked_list.print_ll()
-#https://youtu.be/xRTdfZsAz6Y?si=EMrqVJpXjDDz1kEF
+# https://youtu.be/xRTdfZsAz6Y?si=EMrqVJpXjDDz1kEF