Implement word filtering from file: return words starting with 'w' so…

…rted alphabetically.

src/main/java/core/basesyntax/FileWork.java

@@ -1,8 +1,36 @@
 package core.basesyntax;
 
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
 public class FileWork {
     public String[] readFromFile(String fileName) {
-        //write your code here
-        return null;
+        File inputFile = new File(fileName);
+        List<String> wordsStartingWithW = new ArrayList<>();
+
+        try (BufferedReader incomingFileReader = new BufferedReader(new FileReader(inputFile));) {
+            String currentLine;
+
+            while ((currentLine = incomingFileReader.readLine()) != null) {
+                currentLine = currentLine.replaceAll("[^a-zA-Z\\s]", "").trim();
+                String[] words = currentLine.split("\\s+");
+
+                for (String word : words) {
+                    if (word.toLowerCase().startsWith("w")) {
+                        wordsStartingWithW.add(word.toLowerCase());
+                    }
+                }
+            }
+        } catch (IOException e) {
+            throw new RuntimeException("Cant read file" + e);
+        }
+        String[] filteredResult = wordsStartingWithW.toArray(new String[0]);
+        Arrays.sort(filteredResult);
+        return filteredResult;
     }
 }