diff --git a/Makefile b/Makefile
index ed08dd6..72a96b0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,19 @@
 all: Getting_Started_with_GTK
 
 
+CC=gcc
+CFLAGS=`pkg-config --cflags gtk4 --libs gtk4`
 WARNINGS = -Wall
 DEBUG = -ggdb -fno-omit-frame-pointer
 OPTIMIZE = -O2
 
 
-Getting_Started_with_GTK: Makefile main.c
-	$(CC) -o $@ $(WARNINGS) $(DEBUG) $(OPTIMIZE) main.c
+Getting_Started_with_GTK: main.c
+	$(CC) $(CFLAGS) $(WARNINGS) $(DEBUG) $(OPTIMIZE) -o $@ main.c
 
 clean:
 	rm -f Getting_Started_with_GTK
+	rm -f exec
 
 # Builder will call this to install the application before running.
 install:
@@ -18,7 +21,5 @@ install:
 
 # Builder uses this target to run your application.
 run:
-	./main
-
-# gcc $( pkg-config --cflags gtk4 ) -o main main.c $( pkg-config --libs gtk4 )
+	./exec
 
diff --git a/exec b/exec
new file mode 100755
index 0000000..17423c4
Binary files /dev/null and b/exec differ
diff --git a/main b/main
deleted file mode 100755
index 8a5e7d6..0000000
Binary files a/main and /dev/null differ
diff --git a/main.c b/main.c
index 6edfd95..8d9feb5 100755
--- a/main.c
+++ b/main.c
@@ -1,64 +1,33 @@
-/* main.c
- *
- * Copyright 2024 Jean
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later
- */
-
 #include <gtk/gtk.h>
 
-static void
-print_hello (GtkWidget *widget,
-             gpointer   data)
-{
-  g_print ("Hello World\n");
-}
+static void print (GtkWidget *widget, gpointer   data) {g_print (data);}
 
-static void
-activate (GtkApplication *app,
-          gpointer        user_data)
-{
+static void activate (GtkApplication *app, gpointer user_data) {
   GtkWidget *window;
   GtkWidget *button;
   GtkWidget *box;
-
+/*  GtkBox       GtkGrid     GtkRevealer    GtkStack
+ *  GtkOverlay   GtkPaned    GtkExpander    GtkFixed  */
   window = gtk_application_window_new (app);
   gtk_window_set_title (GTK_WINDOW (window), "Window");
   gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
 
   box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
-  gtk_widget_set_halign (box, GTK_ALIGN_CENTER);
-  gtk_widget_set_valign (box, GTK_ALIGN_CENTER);
-
+  gtk_widget_set_halign (box, GTK_ALIGN_FILL);
+  gtk_widget_set_valign (box, GTK_ALIGN_CENTER); /*  START  CENTER  END  FILL */
   gtk_window_set_child (GTK_WINDOW (window), box);
 
-  button = gtk_button_new_with_label ("Hello World");
+  button = gtk_button_new_with_label ("Hello World !");
 
-  g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_window_destroy), window);
+  g_signal_connect (button, "clicked", G_CALLBACK (print), "Hi ! I'm there\n");
+//  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_window_destroy), window);
 
   gtk_box_append (GTK_BOX (box), button);
 
   gtk_window_present (GTK_WINDOW (window));
 }
 
-int
-main (int    argc,
-      char **argv)
-{
+int main (int argc, char **argv) {
   GtkApplication *app;
   int status;
 
@@ -69,5 +38,3 @@ main (int    argc,
 
   return status;
 }
-
-