code: byte indexToFront(final int index) {
          final byte value = mtf[index];
          System.arraycopy(mtf, 0, mtf, 1, index);
          mtf[0] = value;
  
          return value;
      }
docs: Gets the value from a given index and moves it to the front of the MTF list (inverse Move To Front transform).
  @param index The index to move
  @return The value at the given index