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iOS Swift 2.0 Collections and Control Flow Control Flow With Conditional Statements FizzBuzz

I have no idea what is wrong with this code.

well i did as the directions said make all print functions to return use the variable n and put it inside the function fizzbizz with n being the parameter

My original code in Xcode: http://pastebin.com/Qhr3cUTX

fizzBuzz.swift
import Foundation
func fizzBuzz(n: Int) -> String {
  // Enter your code between the two comment markers
  let n = Int(arc4random_uniform(UInt32(100)))

  switch n {
  case n % 6: return("Buzz")
  case n % 5: return("Fizz")
  case n % 15: return(Int(n))
  default: return("Nothing")
  }

  // End code
  return "\(n)"
}