[RemoveFlatten] Update recipies to remove flatten only if it is before an FC !

src/recipies/RemoveFlatten.cpp

@@ -22,16 +22,25 @@
 
 namespace Aidge {
     void removeFlatten(std::set<std::shared_ptr<Node>> nodes) {
+        assert(nodes.size() == 2 && "Wrong number of nodes to replace\n");
+        std::shared_ptr<Node> fc;
+        for (const auto& element : nodes) {
+            assert((element->type() == "FC" || element->type() == "Flatten") && "Wrong type for the nodes to replace");
+            if (element->type() == "FC"){
+                fc = element;
+            }
+        }
         auto g = std::make_shared<GraphView>();
         g->add(std::set<std::shared_ptr<Node>>({nodes}));
-        g->replaceWith({});
+        g->replaceWith({fc});
     }
 
     void removeFlatten(std::shared_ptr<GraphView> graphView){
         std::map<std::string,NodeRegex*> nodesRegex ;
         nodesRegex["Flatten"] = new NodeRegex("Flatten");
+        nodesRegex["FC"] = new NodeRegex("FC");
         std::vector<std::string> seqRegex;
-        seqRegex.push_back("Flatten;");
+        seqRegex.push_back("Flatten->FC;");
         GRegex GReg(nodesRegex, seqRegex);
         Match matches = GReg.match(graphView);
         std::vector<std::set<std::shared_ptr<Node>>> matchNodes = matches.getMatchNodes();