Code Kata - Kyu 7 - Don't give me five

don't-give-me-five.Swift

// In this kata you get the start number and the end number of a region and should return the count of all numbers except numbers with a 5 in it. The start and the end number are both inclusive!

// Examples:

// 1,9 -> 1,2,3,4,6,7,8,9 -> Result 8
// 4,17 -> 4,6,7,8,9,10,11,12,13,14,16,17 -> Result 12
// The result may contain fives. ;-)
// The start number will always be smaller than the end number. Both numbers can be also negative!

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func dontGiveMeFive(_ start: Int, _ end: Int) -> Int {
  var numbersCount = 0
  
  for number in start...end {
      if String(number).contains("5") != true {
        numbersCount += 1 
      }
    }
 
    return numbersCount
    
}