Generalize the implicit program written in (2) to accept variable meshes, quiescent and flowing initial conditions, and arbitrary step changes in pressure or volume flow rate at the well. Hint:...

Generalize the implicit program written in (2) to accept variable meshes, quiescent and flowing initial conditions, and arbitrary step changes in pressure or volume flow rate at the well.
Hint:
Program the Heaviside step function in a separate function statement, and write arbitrary step changes in pressure or rate in terms of this function. After you validate your program,

write a user-friendly interface using Visual Basic, in order to understand user-based issues in software design.