Add custom dependencies to Makefile.

Makefile

@@ -206,7 +206,9 @@ help:
 
 class.o: class.cpp class.h
 
-project0.o: project0.cpp class.h
+functions.o: functions.cpp functions.h
+
+project0.o: project0.cpp class.h functions.h
 
 ######################
 # TODO (end) #
@@ -215,4 +217,4 @@ project0.o: project0.cpp class.h
 # these targets do not create any files
 .PHONY: all release debug profile clean alltests partialsubmit fullsubmit help
 # disable built-in rules
-.SUFFIXES:
\ No newline at end of file
+.SUFFIXES: