int client_main(){
    int sockfd;
    int size_message = 0;
    char test_message[] = "20649601303";
    // 8642320103885981310
    struct sockaddr_in serv_addr;
    char recvBuffer[NET_BUFFER];

    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        printf("\n Error : Could not create socket \n");
        return 1;
    }

    memset(&serv_addr, '0', sizeof(serv_addr));

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(5555);
    serv_addr.sin_addr.s_addr = inet_addr("198.46.188.120");

    if( connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
    {
       printf("\n Error : Connect Failed \n");
       return 1;
    }

    for(int i = 0; i < 2; i++) {
        size_message = strlen(test_message)  * sizeof(char);

        // writing size + message to server
        write(sockfd, &size_message, sizeof(int));
        write(sockfd, test_message, size_message);
        // reading size + enc_message from server
        read(sockfd,&size_message, sizeof(int));
        read(sockfd,recvBuffer, size_message);
        // formatting as string
        recvBuffer[size_message] = '\0';

        printf("encrypted: %s\n", recvBuffer);
    }



    close(sockfd);

    return 0;
}