Twitter Challenge 2 3/4

////////////////////////////////////////
//Code Written By: Sergio A. Nuñez    //
//Date of Final Revision: 1/20/2017   //
////////////////////////////////////////////////////////////////////////
//Summary of Code:                                                    //
//This program will take an input form the system and decide whether  //
//the input is an email or a phone number then it will do two things  //
//------------------------------------------------------------------- //
//1:                                                                  //
//Email: If an email is detected it will find the '@' symbol then     //
//replace the characters in the email with five '*' and print         //
//--------------------------------------------------------------------//
//2:                                                                  //
//Phone: If a phone number is detected it will extract every digit    //
//and '+' if detected then based on the amount of digits in the       //
//string determine the number of hyphens neccessary. Once Hyphens     //
//are in place iterate through the string replacing all, but the last //
//four digits with '*'s                                               //
////////////////////////////////////////////////////////////////////////

#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;

//--------------------------------------------------
//Prototype for masking function
//Used for modular programming
//--------------------------------------------------
void mask(string& input, bool& inputover);

int main() {
    //--------------------------------------------------------
    //Driver program used only to manage input
    //--------------------------------------------------------

    //Declare and initialize any variables that will be needed

    bool inputover = false;  //When boolean is true it will signal
                             //there is no more input to manage.

    string input;            //String for input

    //Start Loop to get all inputs
    while (!inputover)
    {
        //Get Input and clear Cin to get next input
        getline(cin, input);
        cin.clear();

        //===========================================
        //Begin Modular Programming
        //===========================================

        //Mask input, and check if program over
        mask(input, inputover);
    }
    return 0;
}

//Function for data masking
void mask(string& input, bool& inputover)
{
    //-----------------------------------------
    //Variable declaration
    //-----------------------------------------
    string email, phone;  //Variables used for manipulating input
    int at;               //Integer will store the position of the
                          //'@' in an email address from the input

    //Use Email Procedure
    if (input[0] == 'E')
    {
        //assign input to email for manipulation
        email = input;

        //iterate through email until '@' is found
        for (int i = 3; email[i-1] != '@'; i++)
        {
            //Once '@' is found store it's position
            if (email[i] == '@')
            {
                at = i;
            }
        }
        //Once position is found simply replace all the characters
        //from the second character to the second to last from the '@'
        // ie. From: abcdefghijklmnopqrstuvwxyz@website.com
        //            ^----------------------^
        //     To:   a*****z@website.com
        //
        email.replace(3, at-4, "*****");

        //output result
        cout << email << endl;
    }
    //Use Phone Procedure
    else if (input[0] == 'P')
    {
        //Iterate through input and extract numbers, and +
        //and assign them to phone string for manipulation
        for (int i = 0; i < input.length(); i++)
        {
            if (input[i] > '/' && input[i] < ':' || input[i] == '+')
            {
                phone += input[i];
            }
        }
        //Insert phone identifier at beginning of phone string
        phone.insert(0, "P:");

        //=====================================================
        //applying format, and determining international code
        //=====================================================
        //Note: Standard Phone numbers are length 10 without
        //international code: (XXX) XXX-XXXX
        //if international code is included length will surpass
        //length 10: +XXX (XXX) XXX-XXXX
        //-----------------------------------------------------

        //check length for International code and insert hyphen
        //in phone string if International code is there
        if (phone.length() > 12)
        {
            phone.insert(phone.length() - 10, "-");
        }
        //Add standard hyphens that are included on all phone
        //formats regardless of size or international code
        phone.insert(phone.length() - 4, "-");
        phone.insert(phone.length() - 8, "-");

        //Mask every number except last 4
        for (int i = 0; i <phone.length() - 4; i++)
        {
            if (isdigit(phone[i]))
            {
                phone[i] = '*';
            }
        }

        //Display results
        cout << phone << endl;
    }
    //If no input or if not email or phone end program
    else
    {
        inputover = true;
    }

    //Clear strings for next input
    email.clear();
    phone.clear();
}