add aux branch

aux_bin.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include "aux_lib.h"
+
+#define ARRSZ(arr) (sizeof(arr) / sizeof(arr[0]))
+
+int
+main(int argc, const char *argv[])
+{
+	int n = 5;
+	printf("fibonacci(%d) == %d\n", n, fibonacci(n));
+
+	int arr[] = {1,2,3,4,5};
+
+	bool res = sum_is_odd(arr, ARRSZ(arr));
+	printf("sum_is_odd() == %s\n", res ? "true" : "false");
+
+	return 0;
+}