Update Makefile fix typos

Makefile

@@ -19,7 +19,7 @@ clean:
 	rm -f libax5043.a
 	rm -f */*.o
 	rm -f */*/*.o
-	rm -f 
+	rm -f telem
 
 libax5043.a: ax5043/crc/crc.o
 libax5043.a: ax5043/ax5043support/ax5043tx.o
@@ -41,7 +41,7 @@ cubesatsim: libax5043.a
 cubesatsim: afsk/ax25.o
 cubesatsim: afsk/ax5043.o
 cubesatsim: TelemEncoding.o
-cubesatsim: sensor_extension.c
+cubesatsim: sensor_extension.o
 cubesatsim: main.o
 cubesatsim: codecAO40.o
 	gcc -std=gnu99 $(DEBUG_BEHAVIOR) -o cubesatsim -Wall -Wextra -L./ afsk/ax25.o afsk/ax5043.o TelemEncoding.o sensor_extension.o codecAO40.o main.o -lwiringPi -lax5043 -lm