Added rand() to producer

include/consumer.h

@@ -1,7 +1,7 @@
 #ifndef CONSUMER_H
 #define CONSUMER_H
 
-void Consumer(void);
+void* Consumer(void* arg);
 void consume_item(long int item);
 long int remove_item(void);
 

include/producer.h

@@ -1,7 +1,7 @@
 #ifndef PRODUCER_H
 #define PRODUCER_H
 
-void Producer(void);
+void* Producer(void* arg);
 long int produce_item(void);
 void insert_item(long int item);