Simplify Makefile to compile all C sources

Makefile

@@ -1,28 +1,10 @@
-all: hello mathvars c2f input count countlines blanks unambiguous
+CC   = gcc
+OBJS = $(patsubst %.c,bin/%,$(wildcard *.c))
 
-hello: 01-hello-world.c
+all: $(OBJS)
-	gcc -o ./bin/01-helloworld 01-hello-world.c
 
-mathvars: 02-vars-and-math.c
+$(OBJS):
-	gcc -o ./bin/02-mathvars 02-vars-and-math.c
+	$(CC) -o ./$@ $(patsubst bin/%,%.c,$@)
-
-c2f: 03-celsius-to-fahrenheit.c
-	gcc -o ./bin/03-c2f 03-celsius-to-fahrenheit.c
-
-input: 04-file-copying.c
-	gcc -o ./bin/04-input 04-file-copying.c
-
-count: 05-char-counting.c
-	gcc -o ./bin/05-count 05-char-counting.c
-
-countlines: 06-line-count.c
-	gcc -o ./bin/06-line-count 06-line-count.c
-
-blanks: 07-extra-blanks.c
-	gcc -o ./bin/07-extra-blanks 07-extra-blanks.c
-
-unambiguous: 08-unambiguous.c
-	gcc -o ./bin/08-unambiguous 08-unambiguous.c
 
 clean:
-	$(RM) ./bin/*-*
+	$(RM) ./bin/*