- in: whatever
  out: whatever

s.split("((?<=[^A-Za-z]+)|(?=[^A-Za-z]+))")
  .map { word =>
    if word.isEmpty then word
    else s"${word.head.toUpper}${word.tail.toLowerCase}"
  }
  .mkString

    val splitOnWords = ListHelpers
      .groupConsecutiveBy[String](
        s.toSeq.map(_.toString),
        (x: String) => x.matches("[a-zA-Z]")
      )

    val words = splitOnWords.map(_.mkString)
    words.map { word =>
      if word.length == 1 then word.toUpperCase
      else s"${word.head.toUpper}${word.tail.toLowerCase}"
    }.mkString