use static library instead of object

Makefile

@@ -1,21 +1,24 @@
 CC = gcc
 CFLAGS := -std=c99 -Wall -Wextra -Werror -pedantic -Wvla
-OBJ_RUN := src/student.c src/main.o src/pin_handler.o
+OBJ_RUN := src/student.c
 
 all: run
 
+%.o: %.c
+	@$(CC) $(LFLAGS) $(CFLAGS) -c -o $@ $<
+
+prepare: CFLAGS += -shared
 prepare: src/main.o src/pin_handler.o
+	ar crs src/pin_handler.a $^
+	tar czf student.tar.gz src/pin_handler.a src/student.c src/default_student.c Makefile student.ino src/parser.c
 
 parser: src/parser.o student.ino
 	@$(CC) $(CFLAGS) -o $@ src/parser.o 
 	@./parser ./student.ino
 
 run: parser $(OBJ_RUN) student.ino
-	@$(CC) -o main $(OBJ_RUN)
+	@$(CC) -o main $(OBJ_RUN) src/pin_handler.a
 	@./main
 
-%.o: %.c
-	@$(CC) $(LFLAGS) $(CFLAGS) -c -o $@ $<
-
 clean:
 	$(RM) src/*.o main parser