Working on exercise 3-5 but I'm creating some libraries

ch_03/exercise_03-05/main.c

@@ -0,0 +1,17 @@
+/*
+ *
+ * Exercise 3-5. Write a function itob(n,s,b that converts the integer
+ * m into a base b character representation in the string s. In
+ * particular, itob(n,s,16) formats s as a hexadecimal integer in s.
+ *
+ *
+ * Author: Kun Deng
+ */
+
+#include <stdio.h>
+
+int main()
+{
+
+    return 0;
+}