public override string GenerateCharset(string s)
{
s = Decoratee.GenerateCharset(s);
var uniqueChars = new HashSet <char>();
var collector = new StringBuilder(s.Length);
foreach (var c in s)
{
if (!uniqueChars.Contains(c))
{
uniqueChars.Add(c);
collector.Append(c);
}
}
return(collector.ToString());
}
public override string GenerateCharset(string s)
{
s = Decoratee.GenerateCharset(s);
var collector = new StringBuilder(s.Length * 2);
foreach (var c in s)
{
if (char.IsLetter(c))
{
collector.Append(char.ToLower(c));
collector.Append(char.ToUpper(c));
}
else
{
collector.Append(c);
}
}
return(collector.ToString());
}
public override string GenerateCharset(string s)
{
return(Decoratee.GenerateCharset(s).ToLower());
}