RandomCharacter.swift

func randomCharacter<T: IntervalType where T.Bound == Character>(inRange range: T) -> Character {
    let startScalars = String(range.start).unicodeScalars
    let startCode = startScalars[startScalars.startIndex].value
    
    let endScalars = String(range.end).unicodeScalars
    let endCode = endScalars[endScalars.startIndex].value
    
    let characterCount = distance(startCode, endCode) + 1
    let rndOffset = Int(arc4random_uniform(UInt32(characterCount)))
    
    return Character(UnicodeScalar(startCode + rndOffset))
}