Add: loop and multiplication source code test | expend instruction memory size | Fix: on empty test file

rtl/instruction.v

@@ -1,7 +1,7 @@
 module instruction (input  [31:0] address,
                     output [31:0] instruction);
     
-    reg [7:0] memory [127:0];
+    reg [7:0] memory [1024:0];
 
     assign instruction = {memory[address + 3], memory[address + 2], memory[address + 1], memory[address]};