//main.cpp

#include <iostream>
#include "functions.h"

using namespace std;

int main() {
    const int size = 4;
    char set[size] = { 'e', 't', 'i', 's' };
    char * string = new char[100];
    int counter = 0;
    cout << "Enter your string: " << endl;
    cin.getline(string, 100);

    while (string[counter] != '\0')
    {
        counter++;
    }
    maxOccurancesInString(set, string, size, counter);
    return 0;
}


//functions.cpp

#include <iostream>
#include "functions.h"

int maxOccurancesInString(char * set, char *string, unsigned setSize, unsigned stringSize)
{
    int occurs = 0;
    int * occurances = new int[setSize];
    int counter = 0;

    for (size_t i = 0; i < setSize; i++)
    {
        occurs = 0;
        for (size_t k = 0; k < stringSize; k++)
        {
            if (set[i] == string[k])
            {
                occurs++;
            }
            if (k == stringSize - 1)
            {
                occurances[counter] = occurs;
                counter++;
            }
        }
    }
    int max = occurances[0];
    int positionMax = 0;
    for (int m = 0; m < counter; m++)
    {
        if (occurances[m] > max)
        {
            max = occurances[m];
            positionMax = m;
        }
    }
    std::cout << set[positionMax] <<  " - " << max << "\n";
    return 0;
}


//functions.h

#ifndef _H_FUNCTIONS_H_
#define _H_FUNCTIONS_H_

int maxOccurancesInString(char *, char *, unsigned, unsigned);

#endif