Split string generation code into separate files

tools/common.cc

@@ -0,0 +1,38 @@
+//
+// Common parts of utilities written in C++
+// for providing uniform user experience
+//
+
+#include "common.h"
+
+#include <ostream>
+
+
+const std::string BANNER_LINE = "//-------------------------------------------------------------------------------------------";
+
+
+void ERROR()
+{
+    exit(-1);
+}
+
+void ERROR(const std::string &message)
+{
+    std::cout << "\n" << "ERROR: " << message << "\n\n";
+    exit(-1);
+}
+
+void printBannerLineTop()
+{
+    std::cout << "\n\n\n" << BANNER_LINE << "\n";
+}
+
+void printBannerLineBottom()
+{
+    std::cout << BANNER_LINE << "\n\n";
+}
+
+
+DualStream::DualStream(std::ostream& str1, std::ostream& str2) : str1(str1), str2(str2)
+{
+}