Bug: loading a obj format model's faces data crashed(OpenGL) about assimp HOT 7 OPEN

    for (int meshnum = 0; meshnum < scene->mNumMeshes; meshnum++)
    {
        auto scene_mesh = scene->mMeshes;
        string fileoutputdata = "MeshNum[" + to_string(meshnum) + "]\n";
        string temp = "";
        //this code has problem
        for (unsigned int facenum = 0; facenum < scene_mesh[meshnum]->mNumFaces; ++facenum)
        {
            auto face = scene_mesh[meshnum]->mFaces[facenum];
            if (face.mNumIndices == 3) {
                Triangle triangle;
                triangle.v[0] = face.mIndices[0];
                triangle.v[1] = face.mIndices[1];
                triangle.v[2] = face.mIndices[2];
                for (int i = 0; i < 3; i++)
                {
                    temp += to_string(triangle.v[i]);
                    temp += "/";
                }
                Triangle_ArrayList_add(&mesh->triangles, &triangle);
                temp += "\n";
            }
        }
        temp += "\n";
        ofstream file;
        file.open("facedata.txt", ios::app);
        if (file.is_open())
        {
            file.write(fileoutputdata.c_str(), fileoutputdata.size());
            file.write(temp.c_str(), temp.size());
            file.close();
        }
    }

	for (int meshnum = 0; meshnum < scene->mNumMeshes; meshnum++)
	{
		auto scene_mesh = scene->mMeshes;
		string output = "Mesh[" + to_string(meshnum) + "]\n";
		string temp = "";
		//Vertex Data
		for (int vertexnum = 0; vertexnum < scene_mesh[meshnum]->mNumVertices; vertexnum++)
		{
			Vector3 vertex;
			vertex.x = scene_mesh[meshnum]->mVertices[vertexnum].x;
			vertex.y = scene_mesh[meshnum]->mVertices[vertexnum].y;
			vertex.z = scene_mesh[meshnum]->mVertices[vertexnum].z;
			temp += "x[" + to_string(vertex.x) + "] y[" + to_string(vertex.y) + "] z[" + to_string(vertex.z) + "]\n";
			Vector3_ArrayList_add(&vertices, &vertex);
		}
		ofstream file;
		file.open("importer_vertexdata.txt", ios::app);
		if (file.is_open())
		{
			file.write(output.c_str(), output.size());
			file.write(temp.c_str(), temp.size());
			file.close();
		}
        }

	while (fgets(current_line, 500, file))
	{
		current_token = strtok(current_line, " \t\n\r");

		if (current_token == NULL)
		{
			continue;
		}

		else if (strequal(current_token, "v"))
		{
			Vector3 vertex;
			vertex.x = atof(strtok(NULL, WHITESPACE));
			vertex.y = atof(strtok(NULL, WHITESPACE));
			vertex.z = atof(strtok(NULL, WHITESPACE));
			string temp = "x[" + to_string(vertex.x) + "] y[" + to_string(vertex.y) + "] z[" + to_string(vertex.z) + "]\n";
			ofstream file;
			file.open("origin_vertexdata.txt", ios::app);
			if (file.is_open())
			{
				file.write(temp.c_str(), temp.size());
				file.close();
			}
			Vector3_ArrayList_add(&vertices, &vertex);
		}
    }