strings-are-mutable2.cs

class MainClass {
    static void Main() {
        System.Console.WriteLine("abcdef");
        Mutate("abcdef");
        System.Console.WriteLine("abcdef");
    }

    unsafe static void Mutate(string text) {
        var newLen = text.Length * 2;
        fixed (char* t = text) {
            int* len = (int*)t;
            len--;
            *len = newLen;
            for (int i = 0; i < newLen; i++)
                t[i] = 'y';
        }
    }
}