Feuerex- Giveaway code

#include <iostream>
#include <cstdlib>
#include <windows.h>
#include <string>
#include <fstream>
#include <ctime>

using namespace std;

int main() {

ifstream infile;
ofstream outfile;
char inputFilename[] = "in.txt";
char outpitFilename[] = "out.txt";

cout << "Input the path to the file to open, or input 0 to proceed." << endl;
string inputcustom;
cin >> inputcustom;
int N = inputcustom.length();
char inputcustom2[N];
for (int m = 0;m < N; m++) {


inputcustom2[m] = inputcustom[m];
}
if (cin.fail()) {
    cout << "Incorrect input. The program must be terminated." << endl;
    return 0;
}
end:
cout << "Initial settings checked. Proceed by pressing 0." << endl;
char x;
cin >> x;
if (x != '0') {
    cout << "Looks like you haven't pressed a 0. Try again." << endl;
    goto end;
}
if (inputcustom[0] != '0') {


    cout << "Custom file path chosen." << endl;
infile.open(inputcustom2, ios::in);
} else {
infile.open(inputFilename, ios::in);
}
if (!infile) {
    cout << "Can't open the file." << endl;
    exit(1);
}

outfile.open(outpitFilename, ios::out);

if (!outfile) {
    cout << "Can't open the output file." << endl;
    exit(1);
}
int id;
int i = 0;
string name;
srand(time(NULL));
i = rand()%15+rand()%10-rand()%15+rand()%10-rand()%20;
i = abs(i);
cout << "And the winning number is: " << i << endl;
int iold = i;
bool selectedwinner = false;
while (infile >> id >> name) {
    id = abs(i+rand()%20-rand()%20);
    i++;
    outfile << id << "\t" << name << endl;
    cout << id << "\t" << name << endl;
    if (id == iold) {
        cout << "And we have a winner! Congratulations, " << name << endl;
        selectedwinner = true;
    }
}
if (selectedwinner == true) {
    cout << "Congratulations to the winners!" << endl;
    infile.close();
outfile.close();
}
if (selectedwinner == false) {
    cout << "Seems like nobody was selected. Let's try again!" <<endl;
    infile.close();
outfile.close();
    goto end;
}
cout << "The work is done." << endl;

return 0;
}