C语言实现在字符串中替换指定的字符串

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

void replaceString(char *str, const char *oldStr, const char *newStr) {
    char *pos, temp[1000];
    int index = 0;
    int oldStrLen = strlen(oldStr);
    int newStrLen = strlen(newStr);

    while ((pos = strstr(str, oldStr)) != NULL) {
        strcpy(temp, str);
        index = pos - str;
        str[index] = '\0';
        strcat(str, newStr);
        strcat(str, temp + index + oldStrLen);
    }
}

int main() {
    char str[1000] = "Hello World! Hello World! Hello World!";
    const char oldStr[] = "World";
    const char newStr[] = "Universe";

    printf("原始字符串: %s\n", str);
    replaceString(str, oldStr, newStr);
    printf("替换后的字符串: %s\n", str);

    return 0;
}

运行结果： 

原始字符串: Hello World! Hello World! Hello World!
替换后的字符串: Hello Universe! Hello Universe! Hello Universe!