transposes.java

static Stream<String> transposes(List<WordSplit> splits) {
  return splits.stream()
    .filter(split -> split.right.length() > 1)
    .map(split ->
      split.left +
        split.right.substring(1, 2) +
        split.right.substring(0, 1) +
        split.right.substring(2));
}