How can you remove duplicate characters in a string?

Question

I have to implements a function that takes a string as an input and finds the non-duplicate character from this string.

So an an example is if I pass string str = \"

Answer 1

Console.WriteLine("Enter String");

string str = Console.ReadLine();

string result = "";
result += str[0]; // first character of string

for (int i = 1; i < str.Length; i++)
{
    if (str[i - 1] != str[i])
        result += str[i];
}

Console.WriteLine(result);