fix: typing

dyn_huffman.py

@@ -151,7 +151,7 @@ def encode(input: str) -> str:
     return ' '.join(encoded)[1:]
 
 
-def decode(encoded: str) -> (str, str):
+def decode(encoded: str) -> tuple[str, str]:
     bits = encoded.replace(' ', '')
     tree = Node()
     result = ''