How to fix unreadable ASCII characters in Swift

Issue #444

To avoid compiler error Unprintable ASCII character found in source file, from Swift 5, we can use isASCII.

Run this from the generator app that generates Swift code.

let normalized = weirdString.filter({ $0.isASCII })

For more check, see Character https://developer.apple.com/documentation/swift/character/3127011-isletter

Watch out for

• Delete/House symbol ⌂ code 127 (0x7f)

The above does not seem to work, use find to find  character (copy Sublime Text to see 0x7f character)

find ./ -type f -exec sed -i '' -e 's///' {} \;