How can i add line breaks when rendering Text using X11,

I am making an application that renders texts according to style mentioned on screen using X Windows System and Xft. My code is working fine as shown below.

#include <X11/Xlib.h>
#include <X11/Xft/Xft.h>
char * nowShowing() 
{
 return strdup("This is a sample text This is rendered with new Driver installed This is a sample text his is rendered with new Driver installed"); 
}
int main()
{
XftFont *font;
XftDraw *draw;
XRenderColor render_color;
XftColor xft_color;
char *str;
str = nowShowing();
int x = 70;
int y = 150;
Display *dis = XOpenDisplay (0);
int screen = DefaultScreen (dis);
Window  w = XCreateSimpleWindow (dis, RootWindow (dis, screen),
                                 0, 0, 1200, 300, 1,
                                 BlackPixel (dis, screen),
                                 WhitePixel (dis, screen));
XEvent ev;

render_color.red = 0;
render_color.green =0;
render_color.blue = 0;
render_color.alpha = 0xffff;

XftColorAllocValue (dis,
                    DefaultVisual(dis, screen),
                    DefaultColormap(dis, screen),
                    &render_color,
                    &xft_color);

//font = XftFontOpen(dis, screen,
  //                 XFT_FAMILY, XftTypeString, "charter",
  //                 XFT_SIZE, XftTypeDouble, 20.0,
   //                 NULL);
font = XftFontOpenName(dis,screen,"URW Palladio L:style=Bold Italic"); //it takes a Fontconfig pattern string

draw = XftDrawCreate(dis, w,
                     DefaultVisual(dis, screen),
                     DefaultColormap(dis, screen));

XSelectInput (dis, w, ExposureMask);
XMapWindow (dis, w);
for (;;)
{
    XNextEvent (dis, &ev);
    if (ev.type == Expose)
        XftDrawString8(draw, &xft_color, font, x, y, (XftChar8 *) str,
                       strlen(str));
}
return 0;
}

But i am wondering that how can i add line breaks in the text entered. I tried using "/n" and also tried to make array and used loops but it didn't work.

New line "\n" will not be rendered by Xft. You need to render each line separately with proper offset, depending on font size and desired spacing. I have modified the ending block of your code with sample text rendered two times on separate lines.

if (ev.type == Expose)
    {
     int fonth = font->ascent + font->descent;

     XftDrawString8(draw, &xft_color, font, x, y, (XftChar8 *) str,
                   strlen(str));
     XftDrawString8(draw, &xft_color, font, x, y+fonth, (XftChar8 *) str,
                   strlen(str));
    }