Make separate script or function for the creation of the mapped function

[dgupta7]

The function mapped over the mesh points in OCP_formulation.m can be created outside of OCP_formulation.m. Currently it is confusing since a lot of variables are declared in OCP_formulation.m just for the purpose of creating the mapped function, and not for actually solving the OCP So this part of the code can be move to separate script or function to improve clarity and readability.