#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>

char *to_hex_string(void *input, size_t input_length) {
    char *o = (char*) malloc(input_length * 2 + 1);
    for (size_t i = 0; i < input_length; i++) {
        sprintf(o + i * 2, "%02x", ((uint8_t*)input)[i]);
    }
    o[input_length * 2 - 1] = '\0';
    return o;
}

int main() {
    char *c1 = to_hex_string(u8"hello world", 11);
    char *c2 = to_hex_string(u"hello world", 22);
    char *c3 = to_hex_string(U"hello world", 44);

    printf("UTF-8:\n%s\nUTF-16:\n%s\nUTF-32:\n%s\n", c1, c2, c3);

    free(c1);
    free(c2);
    free(c3);
    return 0;
}