Count duplicate characters from String?

Count duplicate characters from String?

A string Can Contained two or more character in it, but we want to have only one

For Example

Required input and output

Input: Csharpstar
Output: Csharpt

Input: Ganga
Output: Gang

Input: Yahoo
Output: Yaho

Input: ganga
Output: gan

Solution:

You can achieve this by two ways 

1.     One by for loop

2.     Using index of method IndexOf(ch)

Step 1:

public string DuplicateChar(String Str)

        {

            int Count = 0;

            //Str = Str.ToUpper();

            for (int i = 0; i <= Str.Length - 1; i++)

            {

                for(int j=i+1;j<=Str.Length-1;j++)

                {

                    if (Str[i] == Str[j])

                    {

                        Count++;

                    }

                }

            }

            return Count.ToString();

        }

static void Main(string[] args)

        {

            String Name = "Ganga";

            Program obj = new Program();

            Console.WriteLine("Total Duplicate value"+ obj.DuplicateChar(Name));

            Console.ReadLine();

        }

Step 2:

public string DuplicateCharCount(String Str)

        {

            string repeat = "";

            int No = 0;

           // Str = Str.ToUpper();

            foreach (Char ch in Str)

            {

               

                if (repeat.IndexOf(ch) == -1)

                {

                    No++;

                }

                repeat += ch;

            }

            return(Str.Length- No).ToString();

        }

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