diff --git a/src/client/CMakeLists.txt b/src/client/CMakeLists.txt
index 2abf668..e318f4a 100644
--- a/src/client/CMakeLists.txt
+++ b/src/client/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.1)
 project(TCPServerClient LANGUAGES C)
 
-add_executable(client client.c extract_ip_port_from_string.c opt_arg.c)
+add_executable(client client.c utils/extract_ip_port_from_string.c utils/opt_arg.c  ../lib/check_port.c  ../lib/set_sockaddr_in.c)
 
 target_include_directories(client PUBLIC ./)
 
diff --git a/src/client/client.c b/src/client/client.c
index f3832a1..26212cd 100644
--- a/src/client/client.c
+++ b/src/client/client.c
@@ -11,7 +11,8 @@
 #include <netinet/ip.h>
 #include <sys/socket.h>
 #include <sys/types.h>
-#include "opt_arg.h"
+#include "utils/opt_arg.h"
+#include "../lib/set_sockaddr_in.h"
 
 
 int main(int argc, char** argv) {
@@ -21,11 +22,9 @@ int main(int argc, char** argv) {
   static struct option options[] = {{"factorial", required_argument, 0, 0},
 									{"server", required_argument, 0, 0},
 									{0, 0, 0, 0}};
-
   if (handle_options(argc, argv, options, 2, &factorial, &ip_port)) {
 	return 1;
   }
-
   if (factorial == -1 || !strlen(ip_port.ip)) {
 	fprintf(stderr, "Using: %s --factorial n --server 127.0.0.1:20001\n",
 			argv[0]);
@@ -39,10 +38,8 @@ int main(int argc, char** argv) {
   }
 
   struct sockaddr_in server;
-  server.sin_family = AF_INET;
-  server.sin_port = htons(ip_port.port);
-  server.sin_addr.s_addr = *((unsigned long*)hostname->h_addr);
-
+  set_sockaddr_in(&server, AF_INET, ip_port.port,
+				  *((unsigned long*)hostname->h_addr));
   int sck = socket(AF_INET, SOCK_STREAM, 0);
   if (sck < 0) {
 	fprintf(stderr, "Socket creation failed!\n");
@@ -53,7 +50,6 @@ int main(int argc, char** argv) {
 	fprintf(stderr, "Connection failed\n");
 	exit(1);
   }
-
   char task[sizeof(uint64_t)];
   memcpy(task, &factorial, sizeof(uint64_t));
 
@@ -70,7 +66,7 @@ int main(int argc, char** argv) {
 
   uint64_t answer = 0;
   memcpy(&answer, response, sizeof(uint64_t));
-  printf("answer: %llu\n", answer);
+  printf("answer: %lu\n", answer);
 
   close(sck);
 
diff --git a/src/client/extract_ip_port_from_string.c b/src/client/utils/extract_ip_port_from_string.c
similarity index 87%
rename from src/client/extract_ip_port_from_string.c
rename to src/client/utils/extract_ip_port_from_string.c
index 1c4723b..361e6b4 100644
--- a/src/client/extract_ip_port_from_string.c
+++ b/src/client/utils/extract_ip_port_from_string.c
@@ -5,8 +5,8 @@
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
-#include "extract_ip_port_from_string.h"
-#include "opt_arg.h"
+#include "utils/extract_ip_port_from_string.h"
+#include "utils/opt_arg.h"
 
 
 unsigned int convert(char* st) {
diff --git a/src/client/extract_ip_port_from_string.h b/src/client/utils/extract_ip_port_from_string.h
similarity index 100%
rename from src/client/extract_ip_port_from_string.h
rename to src/client/utils/extract_ip_port_from_string.h
diff --git a/src/client/opt_arg.c b/src/client/utils/opt_arg.c
similarity index 87%
rename from src/client/opt_arg.c
rename to src/client/utils/opt_arg.c
index 4201c75..e96cc9e 100644
--- a/src/client/opt_arg.c
+++ b/src/client/utils/opt_arg.c
@@ -2,20 +2,14 @@
 // Created by sergeyampo on 06.06.2020.
 //
 #include <stdio.h>
+#include <string.h>
 #include <getopt.h>
 #include <stdlib.h>
 #include "opt_arg.h"
 #include "extract_ip_port_from_string.h"
+#include "../../lib/check_port.h"
 
 
-int check_port(int port) {
-  if (port < 1024) {
-	printf("port lower than 1024 may not be free\n");
-	return 1;
-  }
-  return 0;
-}
-
 int handle_options(int argc,
 				   char** argv,
 				   struct option options[],
@@ -43,7 +37,7 @@ int handle_options(int argc,
 			break;
 		  case 1: memcpy(server, optarg, strlen(optarg));
 			extract_ip_port_from_string(server, ':', ip_port);
-			if (check_port(ip_port->port))
+			if (check_port(&ip_port->port))
 			  return 1;
 			break;
 		  default:printf("Index %d is out of options\n", option_index);
diff --git a/src/client/opt_arg.h b/src/client/utils/opt_arg.h
similarity index 100%
rename from src/client/opt_arg.h
rename to src/client/utils/opt_arg.h
diff --git a/src/lib/check_port.c b/src/lib/check_port.c
new file mode 100644
index 0000000..0e8780c
--- /dev/null
+++ b/src/lib/check_port.c
@@ -0,0 +1,14 @@
+//
+// Created by khrushv on 13.06.2020.
+//
+#include "check_port.h"
+#include <stdio.h>
+
+
+int check_port(unsigned int* port) {
+  if (*port < 1024) {
+	printf("port lower than 1024 may not be free\n");
+	return 1;
+  }
+  return 0;
+}
diff --git a/src/lib/check_port.h b/src/lib/check_port.h
new file mode 100644
index 0000000..f21aebd
--- /dev/null
+++ b/src/lib/check_port.h
@@ -0,0 +1,12 @@
+//
+// Created by khrushv on 13.06.2020.
+//
+
+
+
+#ifndef TCPSERVERCLIENT_SRC_LIB_CHECK_PORT_H_
+#define TCPSERVERCLIENT_SRC_LIB_CHECK_PORT_H_
+
+int check_port(unsigned int* port);
+
+#endif //TCPSERVERCLIENT_SRC_LIB_CHECK_PORT_H_
diff --git a/src/lib/set_sockaddr_in.c b/src/lib/set_sockaddr_in.c
new file mode 100644
index 0000000..b4a48b6
--- /dev/null
+++ b/src/lib/set_sockaddr_in.c
@@ -0,0 +1,13 @@
+//
+// Created by khrushv on 14.06.2020.
+//
+#include <netinet/in.h>
+#include "set_sockaddr_in.h"
+
+
+void set_sockaddr_in(struct sockaddr_in* server,
+					 short s_port, unsigned short port, unsigned long s_addr) {
+  server->sin_family = s_port;
+  server->sin_port = htons(port);
+  server->sin_addr.s_addr = s_addr;
+}
\ No newline at end of file
diff --git a/src/lib/set_sockaddr_in.h b/src/lib/set_sockaddr_in.h
new file mode 100644
index 0000000..a6d4ed5
--- /dev/null
+++ b/src/lib/set_sockaddr_in.h
@@ -0,0 +1,9 @@
+//
+// Created by khrushv on 14.06.2020.
+//
+
+#ifndef TCPSERVERCLIENT_SRC_LIB_SET_SOCKADDR_IN_H_
+#define TCPSERVERCLIENT_SRC_LIB_SET_SOCKADDR_IN_H_
+void set_sockaddr_in(struct sockaddr_in* server,
+	short s_port, unsigned short port, unsigned long s_addr);
+#endif //TCPSERVERCLIENT_SRC_LIB_SET_SOCKADDR_IN_H_
diff --git a/src/server/CMakeLists.txt b/src/server/CMakeLists.txt
index 2db2b74..4bc4b33 100644
--- a/src/server/CMakeLists.txt
+++ b/src/server/CMakeLists.txt
@@ -1,8 +1,9 @@
 cmake_minimum_required(VERSION 3.1)
 project(TCPServerClient LANGUAGES C)
 
-add_executable(server server.c opt_arg.c)
+add_executable(server server.c utils/opt_arg.c utils/factorial.c  ../lib/check_port.c ../lib/set_sockaddr_in.c)
 
+target_include_directories(server PUBLIC ./)
 find_package(Threads REQUIRED)
 target_link_libraries(server ${CMAKE_THREAD_LIBS_INIT})
 
diff --git a/src/server/server.c b/src/server/server.c
index 54ca658..155a67e 100644
--- a/src/server/server.c
+++ b/src/server/server.c
@@ -13,37 +13,17 @@
 
 #include "pthread.h"
 #include "../lib/thread_pool/thpool.h"
-#include "opt_arg.h"
+#include "../lib/check_port.h"
+#include "utils/opt_arg.h"
+#include "utils/factorial.h"
+#include "../lib/set_sockaddr_in.h"
 
-int check_tnum(unsigned int* tnum) {
-  if (*tnum <= 0) {
-	printf("tnum must be a positive number\n");
-	return 1;
-  }
-  return 0;
-}
-
-int check_port(unsigned int* port) {
-  if (*port < 1024) {
-	printf("port lower than 1024 may not be free\n");
-	return 1;
-  }
-  return 0;
-}
-
-uint64_t factorial(const uint64_t* n) {
-  uint64_t factorial = 1;
-  uint64_t r = *n;
-  for (uint64_t i = 2; i <= r; ++i)
-	factorial *= i;
-  return factorial;
-}
 
 void* socket_thread(void* arg) {
+
   printf("Into thread  %d\n", (int)pthread_self());
   int newSocket = *((int*)arg);
   while (true) {
-	//TODO: make variable for count of parameters
 	unsigned int buffer_size = sizeof(uint64_t);
 	char from_client[buffer_size];
 	int read = recv(newSocket, from_client, buffer_size, 0);
@@ -59,9 +39,9 @@ void* socket_thread(void* arg) {
 	}
 	uint64_t factorial_number = 0;
 	memcpy(&factorial_number, from_client, sizeof(uint64_t));
-	fprintf(stdout, "Receive: %llu \n", factorial_number);
+	fprintf(stdout, "Receive: %lu \n", factorial_number);
 	uint64_t total = factorial(&factorial_number);
-	printf("Total: %llu\n", total);
+	printf("Total: %lu\n", total);
 
 	char buffer[sizeof(total)];
 	memcpy(buffer, &total, sizeof(total));
@@ -78,7 +58,6 @@ void* socket_thread(void* arg) {
 
 int main(int argc, char** argv) {
   size_t options_amount = 2;
-  //TODO: remove "tnum" parameter
   static struct option options[] = {{"port", required_argument, 0, 0},
 									{"tnum", required_argument, 0, 0},
 									{0, 0, 0, 0}};
@@ -87,13 +66,10 @@ int main(int argc, char** argv) {
   int (* callbacks[options_amount])(unsigned int*); //Array of callbacks
   callbacks[0] = check_port;
   callbacks[1] = check_tnum;
-
   unsigned int* handled_options = handle_options(argc, argv, options, options_amount, callbacks);
-
-  threadpool thpool = thpool_init(4);
-
   unsigned port = handled_options[0];
   unsigned tnum = handled_options[1];
+  threadpool thpool = thpool_init(tnum);
 
   if (port == -1 || tnum == -1) {
 	fprintf(stderr, "Using: %s --port 20001 --tnum 4\n", argv[0]);
@@ -107,10 +83,7 @@ int main(int argc, char** argv) {
   }
 
   struct sockaddr_in server;
-  server.sin_family = AF_INET;
-  server.sin_port = htons(port);
-  server.sin_addr.s_addr = htonl(INADDR_ANY);
-
+  set_sockaddr_in(&server, AF_INET, port, INADDR_ANY);
   int opt_val = 1;
   setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt_val, sizeof(opt_val));
 
@@ -137,7 +110,7 @@ int main(int argc, char** argv) {
 	  fprintf(stderr, "Could not establish new connection\n");
 	  continue;
 	}
-    
+	printf("Num of active threads worker  %d\n", thpool_num_threads_working(thpool));
 	thpool_add_work(thpool, (void*)socket_thread, &client_fd);
   }
   thpool_destroy(thpool);
diff --git a/src/server/utils/factorial.c b/src/server/utils/factorial.c
new file mode 100644
index 0000000..feee35d
--- /dev/null
+++ b/src/server/utils/factorial.c
@@ -0,0 +1,14 @@
+//
+// Created by khrushv on 13.06.2020.
+//
+
+#include "factorial.h"
+
+
+uint64_t factorial(const uint64_t* n) {
+  uint64_t factorial = 1;
+  uint64_t r = *n;
+  for (uint64_t i = 2; i <= r; ++i)
+	factorial *= i;
+  return factorial;
+}
\ No newline at end of file
diff --git a/src/server/utils/factorial.h b/src/server/utils/factorial.h
new file mode 100644
index 0000000..a065575
--- /dev/null
+++ b/src/server/utils/factorial.h
@@ -0,0 +1,12 @@
+//
+// Created by khrushv on 13.06.2020.
+//
+
+#include <stdint.h>
+
+#ifndef TCPSERVERCLIENT_SRC_SERVER_FACTORIAL_H_
+#define TCPSERVERCLIENT_SRC_SERVER_FACTORIAL_H_
+
+uint64_t factorial(const uint64_t* n);
+
+#endif //TCPSERVERCLIENT_SRC_SERVER_FACTORIAL_H_
diff --git a/src/server/opt_arg.c b/src/server/utils/opt_arg.c
similarity index 89%
rename from src/server/opt_arg.c
rename to src/server/utils/opt_arg.c
index 8ba675b..fc67ce7 100644
--- a/src/server/opt_arg.c
+++ b/src/server/utils/opt_arg.c
@@ -7,6 +7,14 @@
 #include "opt_arg.h"
 
 
+int check_tnum(unsigned int* tnum) {
+  if (*tnum <= 0) {
+	printf("tnum must be a positive number\n");
+	return 1;
+  }
+  return 0;
+}
+
 unsigned int* handle_options(int argc,
 							 char** argv,
 							 struct option options[],
diff --git a/src/server/opt_arg.h b/src/server/utils/opt_arg.h
similarity index 89%
rename from src/server/opt_arg.h
rename to src/server/utils/opt_arg.h
index f7ac200..43b8372 100644
--- a/src/server/opt_arg.h
+++ b/src/server/utils/opt_arg.h
@@ -10,4 +10,6 @@
 
 unsigned int* handle_options(int, char**, struct option[], const int, int (* [])(unsigned int*));
 
+int check_tnum(unsigned int* tnum);
+
 #endif //TCPSERVERCLIENT_SRC_SERVER_OPT_ARG_H_
\ No newline at end of file