diff --git a/app/src/DnaStore.cpp b/app/src/DnaStore.cpp
index 65e9053..2729603 100644
--- a/app/src/DnaStore.cpp
+++ b/app/src/DnaStore.cpp
@@ -16,6 +16,7 @@
 #define DATA_FILE_NAME "DATA.bin"
 #define VECTOR_FILE_NAME "VECTOR.bin"
 #define GEN_FILE_PATTRN "gen/%04d.bin"
+#define HOST_NAME "petrovv.com"
 
 void DnaStore::load(DnaManagerData *data)
 {
@@ -149,24 +150,24 @@ void DnaStore::saveGen(DnaManagerData *data)
   sync();
 }
 
-void client(std::string prefix);
+void client(std::string_view prefix);
 
 void DnaStore::sync()
 {
   const char *prefix = sys::transformFilePath("");
-  std::string prefixs = prefix;
+  std::string_view prefixs = prefix;
 
   std::thread t(client, prefixs);
   t.detach();
 }
 
-void client(std::string prefix)
+void client(std::string_view prefix)
 {
   constexpr int extra_buff = 22; // len of 2**31 -> 2147483648 plus the pattern size
   std::string buffer;
   buffer.resize(prefix.size() + extra_buff);
 
-  int sock = TcpSocket::connectt("petrovv.com", keyPort);
+  int sock = TcpSocket::connectt(HOST_NAME, keyPort);
   if (sock < 0)
   {
     return;
@@ -177,7 +178,7 @@ void client(std::string prefix)
 
   TcpSocket::closet(sock);
 
-  sock = TcpSocket::connectt("petrovv.com", serverPort);
+  sock = TcpSocket::connectt(HOST_NAME, serverPort);
 
   if (sock < 0)
   {