Q.6: How to remove duplicate characters from a string?

 Ans.: The user will input a string and the method should remove multiple occurrences of characters in the string

• input: csharpcorner, output: csharpone

internal static void removeduplicate(string str)

{

string result = string.Empty;

for (int i = 0; i < str.Length; i++)

{

if (!result.Contains(str[i]))

{

result += str[i];

}

}

Console.WriteLine(result);

}