diff --git a/DS1-2015/Makefile b/DS1-2015/Makefile
index da63454..d5b6599 100644
--- a/DS1-2015/Makefile
+++ b/DS1-2015/Makefile
@@ -1,4 +1,4 @@
-all: $(subst c,exe,$(shell ls *.c))
+all: $(patsubst %.c,%.exe,$(shell ls *.c))
 
 %.exe: %.c
 	gcc $< -o $@ -lm
diff --git a/Exos/Makefile b/Exos/Makefile
new file mode 100644
index 0000000..a632890
--- /dev/null
+++ b/Exos/Makefile
@@ -0,0 +1,9 @@
+all: $(patsubst %.c,%.exe,$(shell ls *.c))
+
+%.exe: %.c
+	gcc $< -o $@
+	
+.PHONY: all clean
+
+clean:
+	rm *.exe
diff --git a/Makefile b/Makefile
index 2b5064a..a632890 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-all: $(subst c,exe,$(shell ls *.c))
+all: $(patsubst %.c,%.exe,$(shell ls *.c))
 
 %.exe: %.c
 	gcc $< -o $@
diff --git a/TP1/Makefile b/TP1/Makefile
index aecc9bb..23f6249 100644
--- a/TP1/Makefile
+++ b/TP1/Makefile
@@ -1,4 +1,4 @@
-all: $(subst c,exe,$(shell ls *.c))
+all: $(patsubst %.c,%.exe,$(shell ls *.c))
 
 E1-1.exe: E1-1.c
 	gcc E1-1.c -o E1-1.exe
diff --git a/TP2/Makefile b/TP2/Makefile
index 24d209f..7f230e8 100644
--- a/TP2/Makefile
+++ b/TP2/Makefile
@@ -1,4 +1,4 @@
-all: $(subst c,exe,$(shell ls *.c))
+all: $(patsubst %.c,%.exe,$(shell ls *.c))
 
 E1-1.exe: E1-1.c
 	gcc E1-1.c -o E1-1.exe
diff --git a/TP3/Makefile b/TP3/Makefile
new file mode 100644
index 0000000..a632890
--- /dev/null
+++ b/TP3/Makefile
@@ -0,0 +1,9 @@
+all: $(patsubst %.c,%.exe,$(shell ls *.c))
+
+%.exe: %.c
+	gcc $< -o $@
+	
+.PHONY: all clean
+
+clean:
+	rm *.exe