So now I’d like to do some shrink of my project for have more clear it but where i can still to implement a new code …
which are the technique that we have available ? Have I to do a kind library ?
I don't understand the question - if you need those libraries, those header files have to be there.
You can bundle them up into another header file if you wish, but for such a small number, it hardly seems worth the effort.
i think whats the op is asking, is there any library that could manage all the library that he is currently using so that he could shrink the size of his code
May be time to move up to a bigger part, like ATmega1284P with 16K SRAM and 128K flash. http://www.crossroadsfencing.com/BobuinoRev17/
Can put one of these together for ~$20 for a Duemilanove type board, with USB/Serial off board (as pictured) or on board wiht MIKROE483 module from mouser.com.