add solution

src/app.js

@@ -1,3 +1,28 @@
 'use strict';
 
-// Write your code here
+/* eslint-disable no-console */
+const readline = require('node:readline');
+const { checkIsValidUserInput } = require('./modules/checkIsValidUserInput');
+const { getBullsAndCows } = require('./modules/getBullsAndCows');
+const { generateRandomNumber } = require('./modules/generateRandomNumber');
+
+const rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout,
+});
+
+rl.question('Put you number: ', (userInput) => {
+  console.log(checkIsValidUserInput(userInput));
+
+  if (checkIsValidUserInput(userInput)) {
+    const numberToGuess = generateRandomNumber();
+    const result = getBullsAndCows(userInput, numberToGuess);
+
+    console.log(`Your input: ${+userInput}`);
+    console.log(`Number to guess: ${+numberToGuess}`);
+    console.log(`Result: ${JSON.stringify(result)}`);
+  } else {
+    console.log('Invalid input. Please enter a valid number.');
+  }
+  rl.close();
+});

src/modules/checkIsValidUserInput.js

@@ -10,6 +10,14 @@
  */
 function checkIsValidUserInput(userInput) {
   /* Write your code here */
+  const testInput = new Set(userInput);
+  const regex = /^[1-9]\d{3}$/;
+
+  if (testInput.size !== userInput.length || !regex.test(userInput)) {
+    return false;
+  }
+
+  return true;
 }
 
 module.exports = {

src/modules/generateRandomNumber.js

@@ -8,6 +8,17 @@
  */
 function generateRandomNumber() {
   /* Write your code here */
+  let numbers = '';
+
+  while (numbers.length < 4) {
+    const number = Math.floor(Math.random() * 9) + 1;
+
+    if (!numbers.includes(number)) {
+      numbers += number;
+    }
+  }
+
+  return Number(numbers);
 }
 
 module.exports = {

src/modules/getBullsAndCows.js

@@ -14,6 +14,22 @@
  */
 function getBullsAndCows(userInput, numberToGuess) {
   /* Write your code here */
+  const result = {
+    bulls: 0,
+    cows: 0,
+  };
+  const userInputStr = userInput.toString();
+  const numberToGuessStr = numberToGuess.toString();
+
+  for (let i = 0; i < 4; i++) {
+    if (userInputStr[i] === numberToGuessStr[i]) {
+      result.bulls += 1;
+    } else if (numberToGuessStr.includes(userInputStr[i])) {
+      result.cows += 1;
+    }
+  }
+
+  return result;
 }
 
 module.exports = {