fix: correct the $dumpfile and $dumpvars

Author: yokeTH

ex01_and_gate/better_and_gate_tb.v

@@ -18,8 +18,8 @@ module better_and_gate_tb ();
     );
 
     initial begin
-        $dumpfile("and_gate_tb.vcd");
-        $dumpvars(0, and_gate_tb);
+        $dumpfile("better_and_gate_tb.vcd");
+        $dumpvars(0, better_and_gate_tb);
 
         a = 0;
         b = 0;

ex02_1_bit_full_adder/better_full_adder_tb.v

@@ -18,8 +18,8 @@ module better_full_adder_tb ();
     );
 
     initial begin
-        $dumpfile("full_adder_tb.vcd");
-        $dumpvars(0, full_adder_tb);
+        $dumpfile("better_full_adder_tb.vcd");
+        $dumpvars(0, better_full_adder_tb);
 
         a   = 0;
         b   = 0;

ex03_4_bit_half_adder/better_half_adder_4_tb.v

@@ -14,8 +14,8 @@ module better_half_adder_4_tb ();
     );
 
     initial begin
-        $dumpfile("half_adder_4_tb.vcd");
-        $dumpvars(0, half_adder_4_tb);
+        $dumpfile("better_half_adder_4_tb.vcd");
+        $dumpvars(0, better_half_adder_4_tb);
 
         a = 4'b0000;
         b = 4'b0000;

ex04_4_input_multiplexer/better_mux_4_tb.v

@@ -18,8 +18,8 @@ module better_mux_4_tb ();
     );
 
     initial begin
-        $dumpfile("mux_4_tb.vcd");
-        $dumpvars(0, mux_4_tb);
+        $dumpfile("better_mux_4_tb.vcd");
+        $dumpvars(0, better_mux_4_tb);
 
         a   = 1'b0;
         b   = 1'b1;