-#define SEND_DATA_ERROR "Send data error!"
-#define RECV_DATA_ANSWER_ERROR "Recv data answer error!"
-#define UNKNOWN_ERROR "Unknown error!"
-#define CONNECT_FAILED "Connect failed!"
-#define BIND_FAILED "Bind failed!"
-#define INCORRECT_LOGIN "Incorrect login!"
-#define INCORRECT_HEADER "Incorrect header!"
-#define SEND_LOGIN_ERROR "Send login error!"
-#define RECV_LOGIN_ANSWER_ERROR "Recv login answer error!"
-#define CREATE_SOCKET_ERROR "Create socket failed!"
-#define WSASTARTUP_FAILED "WSAStartup failed!"
-#define SEND_HEADER_ERROR "Send header error!"
-#define RECV_HEADER_ANSWER_ERROR "Recv header answer error!"
+const char SEND_DATA_ERROR[] = "Error sending data.";
+const char RECV_DATA_ANSWER_ERROR[] = "Error receiving data answer.";
+const char UNKNOWN_ERROR[] = "Unknown error";
+const char CONNECT_FAILED[] = "Failed to connect.";
+const char BIND_FAILED[] = "Failed to bind.";
+const char INCORRECT_LOGIN[] = "Incorrect login.";
+const char INCORRECT_HEADER[] = "Incorrect header.";
+const char SEND_LOGIN_ERROR[] = "Error sending login.";
+const char RECV_LOGIN_ANSWER_ERROR[] = "Error receiving login answer.";
+const char CREATE_SOCKET_ERROR[] = "Failed to create socket.";
+const char SEND_HEADER_ERROR[] = "Error sending header.";
+const char RECV_HEADER_ANSWER_ERROR[] = "Error receiving header answer.";