Added all Testbenches to Modelsim and confirmed working operation

ModelSim/lu.sv

@@ -1,3 +1,5 @@
+`ifndef LU_H_SV
+`define LU_H_SV
 module lu #(parameter width = 2) (
     input logic [1:0] op,
     input logic [2**width-1:0] A,
@@ -10,7 +12,8 @@ module lu #(parameter width = 2) (
 			2'b01:	Y =   A | B;
 			2'b10:	Y =   A ^ B;
 			2'b11:	Y = ~(A | B);
-			default: Y = '0;
+			default:Y = '0;
 		endcase
     end
-endmodule
+endmodule
+`endif