probl cu sufixe prefixe sir carac 2012 iul

#include<iostream>
#include<string>
using namespace std;
int main()
{
    char s1[20], s2[20];
    cin.get(s1, 19);
    cin.get();
    cin.get(s2, 19);
    char keep[10] = { 0 };
    int count = 0;
    for (int i = 0; i<strlen(s1); i++)
        for (int j = 0; j <strlen(s2); j++)
            if (s1[i] == s2[j])
            {
                count = 0;
                if (i + 1 == strlen(s1) && j==0)
                    cout << s1[i] << " ";
                while (s1[i + 1] == s2[j + 1])
                {
                    count++; i++; j++;
                }
                if (count != 0)
                {
                    strncpy(keep, s2, count+1);
                    cout << keep << " ";
                    i--; j--;
                }


            }

    cout << endl << endl;
    system("pause");
    return 0;
}