Show special 0 char as just 0

print_helper.c

@@ -30,6 +30,9 @@ void __printb(void *value, size_t size)
 void print_char(unsigned char c)
 {
 	switch (c) {
+	case 0:
+		printf("0\n");
+		break;
 	case EOF_CHAR:
 		printf("EOF\n");
 		break;