M method
Implementation
MfuncTuple M(Uint8List candidbytes, CandidBytes_i start_i) {
int v = ByteData.sublistView(candidbytes, start_i, start_i+2).getInt16(0, Endian.little);
MfuncTuple m_func_tuple = MfuncTuple(Int16(v), start_i+2);
return m_func_tuple;
}