small reorganization to old client/server, client fixed and sending messages to server

helpers.py

@@ -0,0 +1,7 @@
+HEADER_LENGTH = 10
+
+
+def prepare(message: str, encoding='ascii') -> bytes:
+    """Prepares a message for sending through a socket by adding a proper header and encoding it."""
+    header = f'{len(message):<{HEADER_LENGTH}}'
+    return (header + message).encode(encoding)