【leetcode】独特的电子邮件地址

int numUniqueEmails(char ** emails, int emailsSize){
    char* arr[100] = { 0 };
    int index = 0;
    bool flag = true;
    for (int i = 0; i < emailsSize; i++)
    {
        char* s = (char*)calloc(101, sizeof(char));
        char* p = s; 
        for (int j = 0; j < strlen(emails[i]); j++)
        {
            if (emails[i][j] == '@')
            {
                strcat(s, &emails[i][j]);
                break;
            }
            else if (emails[i][j] == '.')continue;
            else if (emails[i][j] == '+')
            {
                for (int l = j + 1; l < strlen(emails[i]); l++)
                {
                    if (emails[i][l] != '@')continue;
                    strcat(s, &emails[i][l]);
                    break;
                }
                break;
            }
            if (!*p)memcpy(p++, &emails[i][j], 1);
            
        }
        for (int k = 0; k <= index; k++)
        {
            if (arr[k] && !strcmp(arr[k], s))
            {
                flag = false;
                break;
            }
        }
        if (flag) arr[index++] = s;
        flag = true;

    }
    return index;
}