c截取域名

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

void extractDomain(const char *url, char *domain) {
    const char *dot = strrchr(url, '.');
    if (dot != NULL) {
        int len = dot - url + 1;
        strncpy(domain, url + len, strlen(url) - len);
        domain[strlen(url) - len] = '\0';
    } else {
        strcpy(domain, url);
    }
}

int main() {
    const char *url = "www.example.com";
    char domain[100];
    extractDomain(url, domain);
    printf("Extracted Domain: %s\n", domain);
    return 0;
}

void removeExtraDots(char *domain) {
    int i = 0, j = 0;
    while (domain[i] != '\0') {
        if (domain[i] != '.' || (i > 0 && domain[i-1] != '.')) {
            domain[j++] = domain[i];
        }
        i++;
    }
    domain[j] = '\0';
}

#include <idna.h>

void extractIDNDomain(const char *url, char *domain) {
    char *idn = idna_to_ascii_8z(url, IDNA_ALLOW_UNASSIGNED);
    if (idn != NULL) {
        extractDomain(idn, domain);
        free(idn);
    } else {
        strcpy(domain, url);
    }
}