Word reversing without any build in features in C#

 Console.WriteLine("Enter Word reversing: ");

string s1=Console.ReadLine();

string s2= string.Empty; 

for (int i = s1.Length -1; i > -1; i--)

{

    s2 += s1[i].ToString();

}

Console.WriteLine(s2);

OUTPUT

Checking of string contains word contains on another string

 Console.WriteLine("Enter First word: ");

string s1 = Console.ReadLine();

Console.WriteLine("Enter Second word: ");

string s2 = Console.ReadLine();

int j = 0;

for (int i = 0; i < s2.Length; i++)

{

    s1.Contains(s1[i]);

    j++;

}

string s3 = j == s1.Length ? "Word in First word is also present  in the second" : "Word in First word is not present  in the second";

Console.WriteLine(s3);