Erase the contents of the window from the current position of the
    cursor to the bottom of the window. The clrtobot function acts on
    the stdscr window.

    Format

      #include  <curses.h>

      int clrtobot();

      int wclrtobot  (WINDOW *win);

1 - Argument

 win

    A pointer to the window.

2 - Return Values

    OK                 Indicates success.
    ERR                Indicates an error.