[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/trie/radix_tree.py

@@ -6,6 +6,7 @@
 with its parent [https://en.wikipedia.org/wiki/Radix_tree]
 """
 
+
 class RadixNode:
     def __init__(self, prefix: str = "", is_leaf: bool = False) -> None:
         # Mapping from the first character of the prefix of the node
@@ -217,10 +218,10 @@ def test_trie(self) -> None:
         assert root.find("bananas")
 
     def test_trie_2(self) -> None:
-        '''
-        now add a new test case which inserts 
+        """
+        now add a new test case which inserts
         foobbb, fooaaa, foo in the given order and checks for different assertions
-        '''
+        """
         words = "foobbb fooaaa foo".split()
         root = RadixNode()
         root.insert_many(words)