How to find all possible substring of a given string?

How to find all possible substring of a given string?

  public void PossibleString(String x)

        {

            char[] arr = x.ToCharArray();

            int leng = arr.Length;

            string rev="";

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

            {

                rev  = rev + arr[i].ToString();

                Console.Write(rev + " ");

            }

           

         }

        static void Main(string[] args)

        {

            Program p1 = new Program();

         Console.WriteLine(" How to find all possible substring of a given string ? \n");

            p1.PossibleString("shivKumar");

            Console.ReadLine();

        }

OUTPUT:

How to find all possible substring of a given string ?

s sh shi shiv shivK shivKu shivKum shivKuma shivKumar

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