grad_hw1: bugfixes done with tests

splitter/splitter.c

@@ -123,7 +123,9 @@ int split(const char* filename, long max_size) {
     }
 
     if (fprintf(index, "%s %02x\n", part_name, sum) < 0) {
+#ifdef VERBOSE_ERRORS
       fprintf(stderr, "Cannot update index file");
+#endif
       fclose(source);
       fclose(index);
       fclose(part_file);