#include <iostream>
#include <string>
#include <sstream>
#include <vector>

#define CONSOLE_CHAR_WIDTH 80

std::string& center_str(std::string& str, const char ch = ' ')
{
    std::stringstream sstr(str);
    std::string tmpstr;
    std::string::iterator it;
    std::vector<std::string> words;
    int length;

    while (std::getline(sstr, tmpstr,'\n'))
    {
        for (it = tmpstr.begin(); it != tmpstr.end(); it++)
        {
            if (*it == '\t')
            {
                tmpstr.reserve(tmpstr.size() + 4);
                tmpstr.insert(it+1, 4, ch);
                tmpstr.erase(it);
            }
        }
        words.push_back(tmpstr);
    }

    sstr.clear();

    for (auto i : words)
    {
        length = i.length();
        tmpstr = i;
        i.clear();
        i.resize(CONSOLE_CHAR_WIDTH, ch);
        i.replace((CONSOLE_CHAR_WIDTH - length)/2, length, tmpstr);
        sstr << i;
    }

    str = sstr.str();

    return str;
}