Moving zero - change Order / non - change

//this is change the number order

func moveZero(_ arr: inout [Int]){
    guard arr.count > 0  else {
        return
    }
    var zero = arr.count - 1
    var number = 0
    while number < arr.count && number < zero{
        if arr[number] == 0{
            arr.swapAt(zero, number)
            zero -= 1
        }else{
            number += 1
        }
    }
}

var arr = [1,0,3,4,0,5,0,0,7]
moveZero(&arr)

print(arr)

// this is no changing the order
func moveZero2(_ arr: inout [Int]){
    guard arr.count > 0  else {
        return
    }
    var number = 0
    var runner = 0

    while runner < arr.count{
        if arr[runner] != 0{
            arr.swapAt(runner, number)
            runner += 1
            number += 1
        }else{
            runner += 1
        }
    }
    while number < arr.count{
        arr[number] = 0
        number += 1
    }
}


var arr2 = [1,0,3,4,0,5,0,0,7]
moveZero2(&arr2)

print(arr2)