Read the guideline before start

Implement Bulls and cows game so the user can run and play it using command line.

• the program randomly generates a number of 4 different digits
• and asks a player to guess
• the player enters a number of 4 different digits
• the program check the entered number (if it has exactly 4 different digits)
• then computer compares a try with the generated number and shows a result of 'bulls' and 'cows'
• bull - guessed digit is on its place (index)
• cow - guessed digit exists in the number but the place (index) is wrong
• the game ends when the numbers is found
• write a solution using separate modules for generating a number, calculating bulls and cows, validate user input, input/output operations (corresponding files are already created)
• use npm run test command to test your modules
• use npm run play to run the game

Computer makes 1234, user prints 1345. The result is one bull (guessed digit 1 is on it's place) and 2 cows (digits 3 and 4 are present but on wrong places).