Examples and fixing stuff

examples/Makefile

@@ -2,36 +2,31 @@ CC=gcc
 CFLAGS=-Wall -Wextra -Werror -O3
 INCLUDE=-I ../src
 
-dfs: dfs.c
-	$(CC) $< -o $@.exe $(CFLAGS) $(INCLUDE)
-	./$@.exe
-
-example: example.c
-	$(CC) $< -o $@.exe $(CFLAGS) $(INCLUDE)
-	./$@.exe
-
-hanoi: hanoi.c
-	$(CC) $< -o $@.exe $(CFLAGS) $(INCLUDE)
-	./$@.exe
-
-heapsort: heapsort.c
-	$(CC) $< -o $@.exe $(CFLAGS) $(INCLUDE)
-	./$@.exe
-
-sieve: sieve.c
+ifndef FILE
+main:
+	@echo Please define a FILE parameter to run. Examples:
+	@echo "  dfs"
+	@echo "  example"
+	@echo "  hanoi"
+	@echo "  heapsort"
+	@echo "  ice_cream"
+	@echo "  sieve"
+else
+$(FILE): $(FILE).c
 	$(CC) $< -o $@.exe $(CFLAGS) $(INCLUDE)
 	./$@.exe
+endif
 
 
 clean:
-	rm *.exe
-	rm *.txt
+	rm *.exe -f
+	rm *.txt -f
 
 
 memcheck:
 ifndef FILE
 	$(error FILE parameter must be set first to check for leaks)
 else
-	$(CC) $(FILE) -o mem.exe $(CFLAGS) $(INCLUDE) -g
+	$(CC) $(FILE).c -o mem.exe $(CFLAGS) $(INCLUDE) -g
 	valgrind --leak-check=yes ./mem.exe
 endif