用C动态复制特定索引中的字符串

char* strcpy(char* destination, const char* source);

void* malloc(size_t size);

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

char* copySubstring(const char* str, int start, int end) {
    int length = end - start + 1;
    char* substring = (char*)malloc(length + 1); // 分配足够的内存来存储复制后的字符串
    strncpy(substring, str + start, length); // 复制特定索引中的字符串
    substring[length] = '\0'; // 添加字符串结束符
    return substring;
}

int main() {
    const char* str = "Hello, World!";
    int start = 7;
    int end = 11;
    char* substring = copySubstring(str, start, end);
    printf("Copied substring: %s\n", substring);
    free(substring); // 释放动态分配的内存
    return 0;
}