Refactored code structure

src/build/asm/Mnemonic.go

@@ -6,6 +6,7 @@ const (
 	NONE Mnemonic = iota
 	ADD
 	CALL
+	COMMENT
 	DIV
 	JUMP
 	MUL
@@ -23,40 +24,31 @@ func (m Mnemonic) String() string {
 	switch m {
 	case ADD:
 		return "add"
-
 	case CALL:
 		return "call"
-
+	case COMMENT:
+		return "comment"
 	case DIV:
 		return "div"
-
 	case JUMP:
 		return "jump"
-
 	case LABEL:
 		return "label"
-
 	case MOVE:
 		return "move"
-
 	case MUL:
 		return "mul"
-
 	case POP:
 		return "pop"
-
 	case PUSH:
 		return "push"
-
 	case RETURN:
 		return "return"
-
 	case SUB:
 		return "sub"
-
 	case SYSCALL:
 		return "syscall"
+	default:
+		return ""
 	}
-
-	return "NONE"
 }