Add a doctest for previous fix

data_structures/trie/radix_tree.py

@@ -54,6 +54,11 @@ class RadixNode:
             word (str): word to insert
 
         >>> RadixNode("myprefix").insert("mystring")
+
+        >>> root = RadixNode()
+        >>> root.insert_many(['A', 'AA'])
+        >>> root.nodes['A'].nodes['A'].prefix
+        'A'
         """
         # Case 1: If the word is the prefix of the node
         # Solution: We set the current node as leaf