Continued fixing data passages.

ZString.cpp

@@ -3,17 +3,17 @@
 
 namespace coreutils {
 
-   std::ostream& operator<<(std::ostream& os, const ZString& zstring) {
+   std::ostream& operator<<(std::ostream& os, const ZString &zstring) {
       os << zstring;
       return os;
    }
 
-   std::ostream& operator<<(std::ostream& os, const std::string& string) {
+   std::ostream& operator<<(std::ostream& os, const std::string &string) {
       os << string;
       return os;
    }
 
-   std::ostream& operator+(std::ostream& os, const ZString& zstring) {
+   std::ostream& operator+(std::ostream& os, const ZString &zstring) {
       os << zstring;
       return os;
    }