shuffle a string in swift

main.swift
var str = "Hello, World!"

// Convert the string to an array of characters
var chars = Array(str)

// Perform Fisher-Yates shuffle algorithm on the array
for i in 0..<chars.count {
    let j = Int(arc4random_uniform(UInt32(chars.count - i))) + i
    if i != j {
        swap(&chars[i], &chars[j])
    }
}

// Convert the array back to a string
str = String(chars)

print(str) // Outputs a shuffled version of the original string
429 chars
18 lines