Error when using + = to add character to string: String is not identical to UInt8

When trying to use the operator +=

to add Character

to String

, I get the following error:

String is not identical to UInt8

The error is in the line puzzleOutput += char

in the code below:

let puzzleInput = "great minds think alike "
var puzzleOutput = ""

for char in puzzleInput
{
    switch char
    {
    case "a","e","i","o","u":
        continue

    default:
       puzzleOutput += char
    }
}

println(puzzleOutput)

      

        
        
        
      

    

How to add Charater

to String

?