I’m writing a code to revere a word in sentence but getting build error of CS0136: A local or parameter name
“input” can not be declared in this scope because that name is used in an enclosing local scope to define a local or parameter:

        string input = "there are snakes at the zoo";

        Console.WriteLine(input);
        Console.WriteLine(ReverseSentence(input));

        string ReverseSentence(string input)
        {
            string result = "";
            char S = ' ';
            string[] words = input.Split(S);
            foreach (string word in words)
            {
                result += ReverseWord(word) + " ";
            }
            return result.Trim();
        } 

I did not get a proper solution.