let text = "funny face:  ͡ ͜ ͡"
let words = text.components(separatedBy: .whitespacesAndNewlines)
var bookmark = text.startIndex
for word in words {
    let wordSize = word.count
    let remainingRange = Range(bookmark..<text.endIndex)    
    if let matchRange: Range = text.range(of: word, options: .literal, range: remainingRange) {
        let wordIndex = text.distance(from: text.startIndex, to: matchRange.lowerBound) **** CRASHES HERE ****        
        guard let newIndex = text.index(text.startIndex, offsetBy: wordIndex + wordSize, limitedBy: text.endIndex) else { break }
        bookmark = newIndex
    }   
    guard let newIndex = text.index(remainingRange.lowerBound, offsetBy: wordSize, limitedBy: text.endIndex) else { break }

    bookmark = newIndex
}