Wāpuro Rōmaji

A solution to this exercise.

Stuff to test with:

Input Output Notes
konnichiha こんにちは ko+n+ni+chi+ha
oyasuminasai おやすみなさい o+ya+su+mi+na+sa+i
yoroshiku ne よろしくね preserving spaces is optional
kana かな ka+na, however...
kan a かんあ ...adding a space makes it ka+n+a
exodia error x is not a valid letter
cheese error che is not a valid syllable