rot13 function
Encrypt / Decrypt string
by ROT13
Implementation
rot13(String string) {
var encrypted = StringBuffer();
for (int i = 0; i < string.length; i++) {
if (_charset.keys.contains(string[i])) {
encrypted.writeAll([_charset[string[i]]]);
} else {
encrypted.writeAll([string[i]]);
}
}
return encrypted;
}