Setup structure for programs

include/consumer.h

@@ -2,5 +2,7 @@
 #define CONSUMER_H
 
 void Consumer(void);
+void consume_item(int item);
+long int remove_item(void);
 
 #endif

include/producer.h

@@ -2,5 +2,7 @@
 #define PRODUCER_H
 
 void Producer(void);
+long int produce_item(void);
+void insert_item(int item);
 
 #endif