Слово буквами наоборот

#include <iostream>
#include <cstring>
using namespace std;

int main()
{
    const int N = 10000;
    char s[N];
    cin.getline(s, N);

    for (int i = 0; s[i]; )
    {
        while (s[i] == ' ')
        {
            i++;
        }
        if (s[i] == 0)
        {
            break;
        }
        int beg = i;
        while (s[i] && s[i] != ' ')
        {
            i++;
        }
        int end = i - 1;
        //cout << beg << ' ' << end << endl;
        for (int i = beg, j = end; i < j; i++, j--)
        {
            swap(s[i], s[j]);
        }
        for (int i = beg; i <= end; i++)
        {
            cout << s[i];
        }
        cout << ' ';
    }

}