Simplified version of encoding messages into pixels

encode_pixels.dart

/// Steps to encode the entire byte messages into images
for (int i = 0; i < getEncoderCapacity(img); ++i) {
  encodedImg[i] = encodeOnePixel(img[i], paddedMsg[i]);
}

/// Helper function to encode one bit of message into 8 pixels
int encodeOnePixel(int pixel, int msg) {
  int lastBitMask = 254;
  int encoded = (pixel & lastBitMask) | msg;
  return encoded;
}