added a pretty output to JString.

MString.cpp

@@ -186,13 +186,11 @@ namespace coreutils {
       return *this;
    }
    
-//   MString &MString::operator<<(std::string value) {
-//      int temp = length;
-//      int len = length + value.length();
-//      setSize(len);
-//      memcpy(data + temp, value.c_str(), value.length());
-//      return *this;
-//   }
+   MString &MString::operator<<(char value) {
+      setSize(length + 1);
+      data[length - 1] = value;
+      return *this;
+   }
 
 //   MString &MString::operator<<(std::ostream (*f)(std::ostream&)) {
    MString &MString::operator<<(std::basic_ostream<char> (*pf)(std::basic_ostream<char>&)) {