Memory optimization in the code

thanks both for the reply, I have solved in other way that I'll explain:

For my partcular case the core of the software is a function called at regular intervals, and I choose at boot time what function run (I have defined N function, one for each "mode").
Considering that other N-1 functions will be never called I can safely delete it with

delete MyOBJ.prototytpe.myfuncion

before the chosen function is called