C++ :: Append More Characters After Newline Character In Txt File

I'm trying append more characters to a txt file after write title of foreground window and a newline character, but after first character, the next appear after a newline. Here is result => [URL].... and here is my code:

I'm using Dev C++ 4.9.9.2 compiler.

Code:

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
using namespace std;
LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam);

[Code]....

I have made some changes for this =>

Code:

if (str_window)
strcpy(str_window,str_window);
strcat(str_window,"
");
log(str_window);

[Code]...

Now print only first character in digitation after title of active window. Still printing wrong see => [URL]..... Word "good" as sample.