尝试用C语言制作一个Integer to Binary Converter，但它只打印随机字符串

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

char* intToBinary(int num) {
    // 创建一个字符数组，用于存储二进制字符串
    char binary[32];
    int index = 0;

    // 将整数转换为二进制字符串
    while (num > 0) {
        binary[index++] = (num % 2) + '0';
        num /= 2;
    }
    binary[index] = '\0';

    // 反转二进制字符串
    int length = strlen(binary);
    for (int i = 0; i < length / 2; i++) {
        char temp = binary[i];
        binary[i] = binary[length - i - 1];
        binary[length - i - 1] = temp;
    }

    // 将二进制字符串复制到动态分配的内存中
    char* result = (char*)malloc((strlen(binary) + 1) * sizeof(char));
    strcpy(result, binary);

    return result;
}

int main() {
    int num = 42;
    char* binary = intToBinary(num);
    printf("Binary representation of %d: %s\n", num, binary);
    free(binary); // 释放动态分配的内存
    return 0;
}