Added feature bar

Makefile

@@ -1,5 +1,9 @@
-example: main.o foo.o
-	$(CC) main.o foo.o -o $@
+
+SOURCES = $(wildcard *.c)
+OBJECTS = $(SOURCES:.c=.o)
+
+example: $(OBJECTS)
+	$(CC) $(OBJECTS) -o $@
 
 %.o: %.c
 	$(CC) -c $< -o $@
@@ -7,4 +11,4 @@ example: main.o foo.o
 .PHONY: clean
 
 clean:
-	rm -f example *.o
+	rm -f example $(OBJECTS)

bar.c

@@ -0,0 +1,7 @@
+#include "bar.h"
+
+#include <stdio.h>
+
+void bar(void) {
+	puts("Hello World from bar().");
+}

bar.h

@@ -0,0 +1,6 @@
+#ifndef BAR_H
+#define BAR_H
+
+void bar(void);
+
+#endif

main.c

@@ -2,9 +2,11 @@
 #include <stdlib.h>
 
 #include "foo.h"
+#include "bar.h"
 
 int main(void) {
 	puts("Hello World");
 	foo();
+	bar();
 	return EXIT_SUCCESS;
 }