diff --git a/.gitignore b/.gitignore
index 6aea462..d705156 100644
--- a/.gitignore
+++ b/.gitignore
@@ -52,3 +52,7 @@ Thumbs.db
 builds/
 Colleen
 Grace
+Sully
+Colleen_*.c
+Grace_*.c
+Sully_*.c
diff --git a/1_Colleen/Makefile b/1_Colleen/Makefile
index 264d4d3..1ade035 100644
--- a/1_Colleen/Makefile
+++ b/1_Colleen/Makefile
@@ -1,5 +1,8 @@
 
-NAME = Colleen
-SRCS = Colleen.c
+NAME         = Colleen
+SRCS         = Colleen.c
+CLONE        = $(NAME)_kid.c
+CREATE_CLONE = ./$(NAME) > $(CLONE)
 
 include ../MakefileCommon
+
diff --git a/2_Grace/Makefile b/2_Grace/Makefile
index 93dc7f8..4a9495a 100644
--- a/2_Grace/Makefile
+++ b/2_Grace/Makefile
@@ -1,5 +1,8 @@
 
-NAME = Grace
-SRCS = Grace.c
+NAME         = Grace
+SRCS         = Grace.c
+CLONE        = $(NAME)_kid.c
+CREATE_CLONE = ./$(NAME) > $(CLONE)
 
 include ../MakefileCommon
+
diff --git a/2_Grace/tmp_Grace.c b/2_Grace/tmp_Grace.c
deleted file mode 100644
index eb53d15..0000000
--- a/2_Grace/tmp_Grace.c
+++ /dev/null
@@ -1,14 +0,0 @@
-/*comment outside*/
-#include <stdio.h>
-#define not_main main
-
-char *second_function() {
-	return "/*comment outside*/%c#include <stdio.h>%c#define not_main main%c%cchar *second_function() {%c	return %c%s%c;%c}%c%cint not_main() {%c	/*comment inside*/%c	char *program = second_function();%c	printf(program, 10, 10, 10, 10, 10, 34, program, 34, 10, 10, 10, 10, 10, 10, 10, 10, 10);%c	return 0;%c}%c";
-}
-
-int not_main() {
-	/*comment inside*/
-	char *program = second_function();
-	printf(program, 10, 10, 10, 10, 10, 34, program, 34, 10, 10, 10, 10, 10, 10, 10, 10, 10);
-	return 0;
-}
diff --git a/MakefileCommon b/MakefileCommon
index 4905ff8..29620e1 100644
--- a/MakefileCommon
+++ b/MakefileCommon
@@ -31,8 +31,10 @@ RESET    = "\e[0m"
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
 
 # FILES :
-#NAME  -> defined in subfolder makefiles
-#SRCS -> defined in subfolder makefiles
+#NAME         -> defined in subfolder makefiles
+#SRCS         -> defined in subfolder makefiles
+#CLONE        -> defined in subfolder makefiles
+#CREATE_CLONE -> defined in subfolder makefiles
 LIBS          =
 D_SRCS        = .
 D_HEADERS     = .
@@ -55,7 +57,6 @@ ifeq "$(D_OBJS)" "."
 else
   RM_OBJS     = rm -rf $(D_OBJS)
 endif
-F_DIFF        = tmp_$(NAME).c
 
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
@@ -89,21 +90,17 @@ $(NAME): $(OBJS)
 leaks: $(NAME)
 	valgrind --leak-check=full --show-leak-kinds=all ./$(NAME)
 
-diff_clean:
-	rm $(F_DIFF)
-diff_exec:
+diff: $(NAME)
 	@echo $(CYAN)"compare source with output :"$(RESET)
-	./$(NAME) > $(F_DIFF)
-	- diff --color $(F_DIFF) $(SRCS); \
-		if [  $$? -eq 0 ]; then echo $(GREEN)"Files $(NAME) and $(SRCS) are identical"$(RESET); else echo $(RED)":Files $(NAME) and $(SRCS) differ"$(RESET); fi
-diff: $(NAME) diff_exec diff_clean
-diff_keep: $(NAME) diff_exec
+	$(CREATE_CLONE)
+	- diff --color $(CLONE) $(SRCS); \
+		if [  $$? -eq 0 ]; then echo $(GREEN)"Files $(SRCS) and $(CLONE) are identical"$(RESET); else echo $(RED)":Files $(NAME) and $(SRCS) differ"$(RESET); fi
 
 clean:
 	$(RM_OBJS)
-
 fclean: clean
 	rm -f $(NAME)
+	rm -f $(CLONE)
 
 re: fclean all