C++ :: Array Of Char - Shows More Than It Should

I have this code:

#include <iostream>
#include <string.h>
#include <fstream>
using namespace std;
ifstream f("input.txt");
ofstream g("output.txt");

[Code] .....

This program make a copy of the source array, then it removes each character and shows the obtained array.

And when i insert "abcdefghijkl"

it should show this: "

#include <iostream>
#include <string.h>
#include <fstream>
using namespace std;
ifstream f("input.txt");
ofstream g("output.txt");

[Code] .....