fix yosys warnings

Author: timothygu1

src/top.v

@@ -19,7 +19,6 @@ module tt_um_cpu_top (
 );
 
     // All output pins must be assigned. If not used, assign to 0.
-    assign uo_out  = ui_in + uio_in;  // Example: ou_out is the sum of ui_in and uio_in
     assign uio_out = 0;
     assign uio_oe  = 0;
 
@@ -76,11 +75,11 @@ module tt_um_cpu_top (
         .inst_done(inst_done),
         .acc_bits(out_result)
     );
-    assign uo_out  = out_result;
+    assign uo_out = out_result;
     assign uio_out = 8'b0;
     assign uio_oe  = 8'b0;
 
     // List all unused inputs to prevent warnings
-    wire _unused = &{ena, clk, rst_n, 1'b0};
+    wire _unused = &{ena, 1'b0};
 
 endmodule