Fix segfault bug with long sentences, also on 64-bit architectures. The problem was a stack-allocated array that was too large to put on the stack.
Fix segfault bug with long sentences, also on 64-bit architectures. The problem was a stack-allocated array that was too large to put on the stack.

giuliopaci/acopost,giuliopaci/acopost,giuliopaci/acopost,giuliopaci/acopost