如何从C中的字符串中删除标点符号

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

int is_punctuation(char c) {
    return ispunct((unsigned char)c);
}

void remove_punctuation(char *str) {
    int i, j = 0;
    for (i = 0; str[i]; i++) {
        if (!is_punctuation(str[i])) {
            str[j++] = str[i];
        }
    }
    str[j] = '\0';
}

int main() {
    char str[] = "Hello, World!";
    printf("Original string: %s\n", str);
    remove_punctuation(str);
    printf("String without punctuation: %s\n", str);
    return 0;
}

Original string: Hello, World!
String without punctuation: HelloWorld