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

// 动态分配内存以存储替换后的字符串
char* replaceSubstring(const char *str, const char *oldSubstr, const char *newSubstr) {
    int strLen = strlen(str);
    int oldLen = strlen(oldSubstr);
    int newLen = strlen(newSubstr);
    int count=0, i, j, k;
    char *result, *p;

  
/**********Program**********/



/**********  End  **********/
 
    return result;
}

int main() {
    char str[10000];
    char oldSubstr[100];
    char newSubstr[100];
    char *replacedStr;

    // 获取用户输入
    printf("【请输入原字符串：】");
    fgets(str, sizeof(str), stdin);
    str[strcspn(str, "\n")] = 0; // 去除换行符

    printf("【请输入要替换的子串：】");
    fgets(oldSubstr, sizeof(oldSubstr), stdin);
    oldSubstr[strcspn(oldSubstr, "\n")] = 0; // 去除换行符
    if (strstr(str, oldSubstr) == NULL) {
        printf("原字符串不包含所输入的子串。\n");
        return 0;
    }
    printf("【请输入替换后的子串：】");
    fgets(newSubstr, sizeof(newSubstr), stdin);
    newSubstr[strcspn(newSubstr, "\n")] = 0; // 去除换行符

    replacedStr = replaceSubstring(str, oldSubstr, newSubstr);
    printf("【示例输出：】%s\n", replacedStr);

    // 释放动态分配的内存
    free(replacedStr);

    return 0;
}