add 203 codes

Blatt02/A203/util.h

@@ -0,0 +1,16 @@
+#ifndef UTIL_H 
+#define UTIL_H
+
+#include <stdio.h>
+#include "arp_packet_st.h"
+
+#define TRUE 1
+#define FALSE 0
+
+void print_hex(uint8_t * array, size_t size);
+void print_u16_hex(uint16_t number);
+void print_u8_hex(uint8_t number);
+uint16_t combine_uint8(uint8_t high, uint8_t low);
+uint32_t combine_uint8_32(uint8_t * arr);
+
+#endif