GTK Casting Problem

[Chris <chrishax comcast net>]

Hello,

I am new to gtk.
To learn the language I am writing simple
programs.
I want to be able to create 3 buttons, named
Button 1, Button 2 & Button 3.
If I explicitly initialize them it works.
When I pull the Initilize into a for loop
things start to go wrong.
I think that I am either not using the proper type
or not properly casting them.
The result is a segmentation error when I compile
which I think means a pointer is not correct.
If anyone knows how to fix this issue, it would be
greatly appreciated.
I have placed in bold the two sections
that I think apply to the problem.

My code is as follows:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gtk/gtk.h>

static void button_cb (GtkWidget *widget, gpointer data)
   {
       g_print ("Hello - %s was pressed\n", (gchar *) data);
   }

static void delete_event_cb(GtkWidget *widget, GdkEvent *event, gpointer 
data)
   {
       g_print ("A delete event has occurred\n");
       gtk_main_quit();
   }

int main( int   argc,
         char *argv[] )
   {
       GtkWidget *window;
       GtkWidget *button;
       GtkWidget *box1;

*        gpointer label;
       gint i;
*
       gtk_init (&argc, &argv);
  
       window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
       gtk_window_set_title (GTK_WINDOW (window), "Test Program");
       gtk_container_set_border_width (GTK_CONTAINER (window), 50);
       g_signal_connect (G_OBJECT (window), "delete_event", G_CALLBACK 
(delete_event_cb), NULL);
    
       box1 = gtk_hbox_new (FALSE, 0);
       gtk_container_add (GTK_CONTAINER (window), box1);

       for (i=1; i<=3; i=i+1)
         {

           *label = (gpointer)"Button ";
           strcat (label, (gpointer) i);
           button = gtk_button_new_with_label ((gchar *)label);
           g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK 
(button_cb), label);*

           gtk_box_pack_start (GTK_BOX(box1), button, TRUE, TRUE, 0);
           gtk_widget_show (button);
         }

       gtk_widget_show (box1);
       gtk_widget_show (window);
  
       gtk_main ();
  
       return 0;
   }