some cleanups here and there

Makefile

@@ -1,7 +1,7 @@
 # Define the object files
 OBJS = bin/boot.o bin/kernel.o bin/idt.o bin/isr.o bin/screen.o \
        bin/utils.o bin/string.o bin/stdio.o bin/disk.o bin/pic.o bin/pit.o \
-       bin/keyboard.o bin/paging.o bin/heap.o bin/page_alloc.o bin/page_tables.o \
+       bin/keyboard.o bin/paging.o bin/page_alloc.o bin/page_tables.o \
        bin/fat.o bin/task.o bin/switch.o bin/sys_exit.o bin/gdt.o bin/isr-asm.o
 
 # Define the compiler and assembler
@@ -100,9 +100,6 @@ bin/keyboard.o: src/drivers/keyboard.c
 bin/paging.o: src/mm/paging.c
 	$(CC) $(CFLAGS) -c $< -o $@
 
-bin/heap.o: src/mm/heap.c
-	$(CC) $(CFLAGS) -c $< -o $@
-
 bin/page_alloc.o: src/mm/page_alloc.c
 	$(CC) $(CFLAGS) -c $< -o $@