feat: libraries lab complete

OSs/lab-libs/main.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <math.h>
+#include "lib.h"
+
+#define FIBO_NUM 15
+
+#define SIN_A 1.6
+#define SIN_B 3.7
+#define ZEROIN_ERR 0.001
+
+int main()
+{
+    printf("fibonachi number under index %u: %zu\n", FIBO_NUM, fibo(FIBO_NUM));
+    printf("zero of sin(x) in interval (%lf %lf) is %lf\n",
+            SIN_A, SIN_B, zeroin(sin, ZEROIN_ERR, SIN_A, SIN_B));
+    return 0;
+}