Removed unused common.h and corrected print statement

02/concurrency/Makefile

@@ -2,11 +2,11 @@ all: threads threads-notv
 
 CFLAGS=-fcf-protection=none -fno-asynchronous-unwind-tables -m32 -fno-pie -no-pie 
 
-threads: threads.c common.h common_threads.h
+threads: threads.c common_threads.h
 	gcc $(CFLAGS) -m32 -O1 -S threads.c
 	gcc $(CFLAGS) -m32 -o threads threads.s -Wall -pthread
 
-threads-notv: threads-notv.c common.h common_threads.h
+threads-notv: threads-notv.c common_threads.h
 	gcc $(CFLAGS) -m32 -O1 -S threads-notv.c
 	gcc $(CFLAGS) -m32 -o threads-notv threads-notv.s -Wall -pthread
 

02/concurrency/threads-notv.c

@@ -1,6 +1,5 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include "common.h"
 #include "common_threads.h"
 
 int counter = 0; 
@@ -16,7 +15,7 @@ void *worker(void *arg) {
 
 int main(int argc, char *argv[]) {
 	if (argc != 2) { 
-		fprintf(stderr, "usage: threads <loops>\n"); 
+		fprintf(stderr, "usage: threads-notv <loops>\n"); 
 		exit(1); 
 	} 
 	loops = atoi(argv[1]);

02/concurrency/threads.c

@@ -1,6 +1,5 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include "common.h"
 #include "common_threads.h"
 
 volatile int counter = 0;