func hex2ascii (example: String) -> String {

let chars = Array(example)
let numbers = map (stride(from: 0, to: chars.count, by: 2)) {
    strtoul(String(chars[$0 ..< $0+2]), nil, 16)
}

var final = ""
var i = 0

while i < numbers.count {
    final.append(Character(UnicodeScalar(Int(numbers[i]))))
    i++
}
return final
}

%22 %36 %C6 %65 %70 %20 %61 %E6 %62 %61 %74 %74 %65 %22 %C6 %22

<01736c65 65702061 6e642062 61747465 72206c65>

func hex2ascii (example: String) -> String
{

    var chars = [Character]()

    for c in example.characters
    {
        chars.append(c)
    }

    let numbers =  stride(from: 0, to: chars.count, by: 2).map{
                strtoul(String(chars[$0 ..< $0+2]), nil, 16)
    }

    var final = ""
    var i = 0

    while i < numbers.count {
        final.append(Character(UnicodeScalar(Int(numbers[i]))))
        i++
    }

    return final
}

var str = hex2ascii("736c65657020616e6420626174746572206c65")

print("string is (str)")

func hex2ascii (example: String) -> String
{
var numbers = [UInt8]()
var from = example.startIndex
while from != example.endIndex
{
    let to = from.advancedBy(2, limit: example.endIndex)
    numbers.append(UInt8(example[from ..< to], radix: 16) ?? 0)
    from = to
}

var final = ""
var i = 0

while i < numbers.count {
    final.append(Character(UnicodeScalar(Int(numbers[i]))))
    i+=1
}

return final
}

var str = hex2ascii("736c65657020616e6420626174746572206c65")

print("string is (str)")

func hex2ascii (example: String) -> String {

    var chars = [Character]()

    for c in example.characters {
        chars.append(c)
    }

    let numbers =  stride(from: 0, to: chars.count, by: 2).map{
        strtoul(String(chars[$0 ..< $0+2]), nil, 16)
    }

    var final = ""
    var i = 0

    while i < numbers.count {
        final.append(Character(UnicodeScalar(Int(numbers[i]))!))
        i += 1
    }

    return final
}