Work to add C style entry points to library that allow most functionality

src/Evaluator/BinaryEvaluation.cpp

@@ -69,8 +69,8 @@ shared_ptr<StringEvalValue> Evaluator::EvaluateStringBinary(BoundBinaryExpressio
         throw;
     std::ostringstream strs;
     auto left = this -> EvaluateStringExpression(expression->GetLeft());
-    strs << left->EvaluateString();
+    strs << *left->EvaluateString();
     auto right = this -> EvaluateExpression(expression->GetRight());
-    strs << right->EvaluateString();
+    strs << *right->EvaluateString();
     return make_shared<StringEvalValue>(strs.str());
 }