【无标题】

分析：

1. 字符串输入 string 与 char[] 的转换
2. 主串查找子串位置（忽略大小写）
3. 主串替换子串

#include 
 
using namespace std;
 
int equal(char a,char b){
    if(a >= 'A' && a <= 'Z' ) a += 'a' - 'A';
    if(b >= 'A' && b <= 'Z') b += 'a'-'A';
    return a == b;
}
char*substr(char*s, char*sub){
    char *p, *q;
    while(*s){
        for(p = s, q = sub; *q && equal(*p, *q); p++, q++);
        if(*q=='\0') return s;
        s++;
    }
    return 0;
}

int main(){
    int time = 1;
    string code, project, str;
    
    getline(cin, project);
    getline(cin, code);
    getline(cin, str);
    
 int len_str = str.size() + 1;
 char *arr_str = new char[len_str];
 strcpy(arr_str, str.c_str());
 
 int len_pro = project.size() + 1;
 char *arr_pro = new char[len_pro];
 strcpy(arr_pro, project.c_str());
 
 int len_code = code.size() + 1;
 char *arr_code = new char[len_code];
 strcpy(arr_code, code.c_str());
    
    char *p;
    if((p = substr(arr_str, arr_pro)) != 0) {
        if (time == 1){
            str.replace(p - arr_str, project.size(), code);
            time = 0;
            cout << str <<endl;
        }
    }
    
    int len_str_2 = str.size() + 1;
 char *arr_str_2 = new char[len_str_2];
 strcpy(arr_str_2, str.c_str());
 
 
 char *q;
    while((q = substr(arr_str_2, arr_pro)) != 0) {
        if (time == 0){
            str.replace(q - arr_str_2, project.size(), "*");
        }
        len_str_2 = str.size() + 1;
     arr_str_2 = new char[len_str_2];
     strcpy(arr_str_2, str.c_str());
        
    }
    cout << str <<endl;
 
 
    return 0;
}
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