Hangman c#

using System;

namespace Hangman
{
    internal class Program
    {
        static string word;

        static char[] guess;

        static int lives;

        static char input;

        static void Main(string[] args)
        {
            update();

        }

        static void start()
        {
            Console.Clear();
            word = pickWord();
            fillBlank();

            lives = 5;
        }
        static void update()
        {
            start();

            while (lives > 0)
            {


                printWord();

                promptPlayer();

                input = getInput();

                checkInput(input);

                checkGameOver();
            }
        }

        static string pickWord()
        {
            string[] words = new string[]
            {
                "hydrophobia", "bacteria", "car","dog","electricity","humanity","compound"
            };

            Random rnd = new Random();
            int index = rnd.Next(0, words.Length);

            return words[index];
        }

        static void fillBlank()
        {
            guess = new char[word.Length];
            for (int i = 0; i < word.Length; i++)
            {
                guess[i] = '_';
            }
        }

        static void printWord()
        {
            Console.WriteLine("Guess the word: ");

            for (int i = 0; i < guess.Length; i++)
            {
                Console.Write(guess[i] + " ");
            }
            Console.WriteLine();
        }

        static void promptPlayer()
        {
            Console.Write("Enter a letter: ");

            if (lives < 5) { Console.WriteLine($"\nYou have {lives} lives left"); }
        }

        static char getInput()
        {
            char input = char.Parse(Console.ReadLine());

            return input;
        }

        static void checkInput(char input)
        {
            bool correct = false;

            for (int i = 0; i < word.Length; i++)
            {
                if (word[i] == input)
                {
                    guess[i] = input;
                    correct = true;
                    Console.Clear();
                }
            }

            if (!correct)
            {
                lives--;
                Console.Clear();
            }
        }

        static void checkGameOver()
        {
            if (lives == 0)
            {
                Console.WriteLine("Game over!\n");
            }

            else if (!guess.Contains('_'))
            {
                Console.WriteLine("You win!\n");
            }
        }
    }
}