Create Guild.update_username().

classes/guild.py

@@ -209,3 +209,23 @@ class Guild:
             str: string of json representation of Guild
         """
         return json.dumps(self.to_dict(), indent=4)
+
+    def update_username(self, old_username: str, new_username: str) -> "list[Table]":
+        """
+        Collects list of tables that had a username updated. Sends old and new username
+        to the table function to update username.
+
+        Args:
+            old_username (str): Username to replace. Sent to table function
+            new_username (str): Username to replace with. Sent to table function
+
+        Returns:
+            list[Table]: All the tables that had a username updated
+        """
+        updated_tables: "list[Table]" = []
+
+        for table in self.tables:
+            if table.update_username(old_username, new_username):
+                updated_tables.append(table)
+
+        return updated_tables