Update getStringPartByNr.ino

[Krong]

last char in last part was skipped

[hoanghuynhman]

that's right. please fix it.

[herrxyz]

just remove the "-1" from for(int i = 0; i<data.length()-1; i++)
or replace with following
for(int i = 0; i<data.length(); i++)
worked for me, even if I think it will move 1 char too far

edit: you already sent in a working solution, did'nt see it