ConvertStringToArray

solve1.swift

func splitCapitalString(_ textString:String) -> [String] {
  
  var newStringArray = [String]()
  
  for char in textString {
    if String(char) == String(char).uppercased() {
      newStringArray.append(" ")
    }
    newStringArray.append(String(char))
  }
  
  //joined 把加工後的array 變成字串  "HeMoYo" -> " He Mo Yo"
  //trimmingCharacters 移除左右空白
  //compoents 把空白拆開為Array, 也可以用 Split(separator:), 但是會回傳 SubSequence type
  return newStringArray.joined().trimmingCharacters(in: .whitespacesAndNewLines).compoents(separatedBy: " ")
  
}