929. Unique Email Addresses

    func numUniqueEmails(_ emails: [String]) -> Int {
        var nSet = Set<String>()
        for e in emails{
            nSet.insert(parseEmail(e))
        }
        return nSet.count
    }

    func parseEmail(_ str: String) -> String{
        // var i = 0
        let arr = Array(str)
        var res = ""
        var foundP = false
        for i in 0 ..< arr.count {
            if arr[i] == "@"{
                res.append(String(arr[i ..< arr.count ]))
                return res
            }
            if foundP { continue }
            if arr[i] == "+" {
                foundP = true
                continue
            }
            if arr[i] == "." {continue}
            res.append(arr[i])
        }
        return res
    }