#include <cstring>
#include <cerrno>
#include <cctype>
#include "nem_oo.h"

namespace sajat {
    int atoi(const char *p, int base)
    {
        long int number = 0;
        int strstart = -1;
        int strend = std::strlen(p);

        for (int i = 0; i < strend; i++)
        {
            if (strstart == -1)
            {
                if (p[i] >= 48 && p[i] <= 57)
                    strstart = i;
            }
            else
            {
                if (p[i] < 48 || p[i] > 57)
                {
                    strend = i;
                    break;
                }
            }
        }

        if (strstart == -1)
            throw "V90GJ3";

        for (int i = strstart; i < strend; i++)
        {
            if ((p[i] - 48) >= base)
                throw "V90GJ3";

            number *= 10;
            number += p[i] - 48;
        }

        if (base == 10)
        {
            return number;
        }

        int out = 0;
        int i = 0;
        long int remainder = 0;

        while (number > 0)
        {
            remainder = number % 10;
            number /= 10;
            out += remainder * pow(base, i);
            i++;
        }

        return out;
    }

    char* strcat(const char *p1, const char *p2)
    {
        char* array = new char[std::strlen(p1) + std::strlen(p2) + 1];
        std::strcpy(array, p1);
        std::strcat(array, p2);
        return array;
    }

    char *unique(char *first, char *last)
    {
        for (char *temp = first + 1; temp <= last; temp++)
            if (*temp != *first )
                *++first = *temp;

        return first;
    }
}