如何使用C将二进制字符串转换为十六进制？

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

char *binary_to_hex(const char *binary_str) {
    int len = strlen(binary_str);
    int hex_len = len / 4;
    char *hex_str = (char *)malloc(hex_len + 1);
    memset(hex_str, 0, hex_len + 1);

    for (int i = 0; i < len; i += 4) {
        char temp[5] = {0};
        strncpy(temp, binary_str + i, 4);
        int decimal = 0;
        for (int j = 0; j < 4; j++) {
            decimal = decimal * 2 + (temp[j] - '0');
        }
        sprintf(hex_str + i / 4, "%X", decimal);
    }
    return hex_str;
}

int main() {
    char binary_str[] = "1010010111001101101011000110110001101111";
    char *hex_str = binary_to_hex(binary_str);
    printf("十六进制字符串：%s\n", hex_str);
    free(hex_str);
    return 0;
}