fixed file structore

modules/other/system.nix

@@ -0,0 +1,28 @@
+{
+    config,
+    lib,
+    ...
+}: with lib; let
+    cfg = config.myOptions.other.system;
+in {
+    options.myOptions.other.system = {
+        hostname = mkOption {
+            description = "hostname for this system";
+            type = types.str;
+        };
+
+        username = mkOption {
+            description = "username for this system";
+            type = types.str;
+        };
+    };
+
+    config = {
+        networking.hostName = cfg.hostname;
+
+        users.users.${cfg.username} = {
+            isNormalUser = true;
+            extraGroups = [ "wheel" ];
+        };
+    };
+}