Until now, LLT works as a function which deals with inputs from user. The idea is to make LLT work directly with the Wing definition, the task is that a Wing could be a collection of many surfaces, so, the algorithm should be redesigned in order to handle those cases.
The total wing drag is the sum of Cd_0 (drag due to shear stresses and pressure distributions on the airfoil) and the induced drag related to the efficiency of the load distribution and the wing tip vorticity.
Task: implement a way to assign the Cd_0 for a wing.