fix(main): decalre args upstream

src/main.c

@@ -8,17 +8,20 @@
 int main() {
   char *input_line;
   unsigned char exit_code = 0;
+  struct Args args;
 
   while (1) {
+    args.argc = 0;
+
     printf("$ ");
     input_line = read_a_line(stdin);
     if (input_line == NULL) {
       return exit_code;
+    } else {
+      args = parse(input_line);
+      free(input_line);
     }
 
-    struct Args args = parse(input_line);
-    free(input_line);
-
     if (args.argc > 0) {
       exit_code = invoke(args);
     }