fix makefile

Makefile

@@ -3,7 +3,7 @@ all: build assemble
 .PHONY: build
 build:
 	mkdir -p build
-	javac -Xlint src/*.java -d build
+	javac -Xlint $(shell find src -type f -name '*.java') -d build
 
 assemble:
 	cd build/; jar cvmf ../MANIFEST.MF ../Elevator.jar *.class

src/module-info.java

@@ -1,3 +0,0 @@
-module elevator {
-	requires java.desktop;
-}