fix module declarations

and.v

@@ -4,10 +4,7 @@
 `include "nand.v"
 `include "not.v"
 
-module And (a, b, out);
-    input wire a;
-    input wire b;
-    output wire out;
+module And (input a, input b, output out);
     wire out_bar;
 
     Nand u1(.a(a), .b(b), .out(out_bar));

mux.v

@@ -5,12 +5,7 @@
 `include "and.v"
 `include "or.v"
 
-module Mux (a, b, sel, out);
-    input wire a;
-    input wire b;
-    input wire sel;
-    output wire out;
-
+module Mux (input a, input b, input sel, output out);
     wire sel_bar;
     wire a_sel;
     wire b_sel;

nand.v

@@ -1,10 +1,7 @@
 `ifndef _nand_v
 `define _nand_v
 
-module Nand (a, b, out);
-    input wire a;
-    input wire b;
-    output wire out;
+module Nand (input a, input b, output out);
 
     assign out=~(a&&b);
 endmodule

nor.v

@@ -4,10 +4,7 @@
 `include "or.v"
 `include "not.v"
 
-module Nor (a, b, out);
-    input wire a;
-    input wire b;
-    output wire out;
+module Nor (input a, input b, output out);
     wire out_bar;
 
     Or u1(.a(a), .b(b), .out(out_bar));

not.v

@@ -3,9 +3,7 @@
 
 `include "nand.v"
 
-module Not (in, out);
-    input wire in;
-    output wire out;
+module Not (input in, output out);
 
     Nand u1(.a(in), .b(in), .out(out));
 endmodule

or.v

@@ -4,10 +4,7 @@
 `include "nand.v"
 `include "not.v"
 
-module Or (a, b, out);
-    input wire a;
-    input wire b;
-    output wire out;
+module Or (input a, input b, output out);
     wire a_bar;
     wire b_bar;
 

xor.v

@@ -3,11 +3,7 @@
 
 `include "nand.v"
 
-module Xor (a, b, out);
-    input wire a;
-    input wire b;
-    output wire out;
-
+module Xor (input a, input b, output out);
     wire tmp1;
     wire tmp2;
     wire tmp3;