feat(ex04): done

ex04/include/utils.h

@@ -0,0 +1,19 @@
+#ifndef UTILS_H
+#define UTILS_H
+
+#include "mystd.h"
+
+void delay_ms(uint16_t count);
+
+void ft_bzero(void* data, uint16_t size);
+
+uint8_t ft_stridx(const char* str, char chr);
+uint8_t ft_ftoa(float val, char* out, uint16_t precision);
+
+void* ft_memcpy(void* dest, void* src, uint16_t len);
+bool  ft_memcmp(void* s1, void* s2, uint16_t len);
+
+// return -1 on not hex digit
+uint8_t is_hex_digit(char chr);
+
+#endif /* UTILS_H */