diff --git a/PersianSwear.java b/PersianSwear.java
index 9e480e1..9bfda18 100644
--- a/PersianSwear.java
+++ b/PersianSwear.java
@@ -7,73 +7,83 @@
 import java.util.regex.Pattern;
 
 public class PersianSwear {
-    private final ArrayList<String> swearWords = new ArrayList<>();
-
-     public PersianSwear() {
-         try (BufferedReader reader = new BufferedReader(new FileReader("data.txt"))) {
-             String line;
-             while ((line = reader.readLine()) != null) {
-                 String[] splitedWords = line.split(", ");
-                 swearWords.addAll(List.of(splitedWords));
-             }
-         } catch (IOException e) {
-             throw new RuntimeException(e);
-         }
-    }
-
-    private String clearWord(String word) {
-        Pattern pattern = Pattern.compile("[\\p{P}\\p{Mn}\\p{S}\\p{javaDigit}]");
-        Matcher matcher = pattern.matcher(word);
-        matcher.reset();
-
-        return matcher.replaceAll("").trim()
-                .replace("\u200c", " ")
-                .replace("ي", "ی")
-                .replace("ك", "ک")
-                .replace("ـ", "");
-    }
 
-    public void addWord(String word) {
-        swearWords.add(word.trim());
+  private final List<String> swearWords = new ArrayList<>();
+
+  public PersianSwear() {
+    try (
+      BufferedReader reader = new BufferedReader(new FileReader("data.txt"))
+    ) {
+      String line;
+      while ((line = reader.readLine()) != null) {
+        String[] splitedWords = line.split(", ");
+        swearWords.addAll(List.of(splitedWords));
+      }
+    } catch (IOException e) {
+      throw new RuntimeException(e);
     }
-
-    public void addWords(String[] words) {
-        swearWords.addAll(List.of(words));
+  }
+
+  private String clearWord(String word) {
+    Pattern pattern = Pattern.compile("[\\p{P}\\p{Mn}\\p{S}\\p{javaDigit}]");
+    Matcher matcher = pattern.matcher(word);
+    matcher.reset();
+
+    return matcher
+      .replaceAll("")
+      .trim()
+      .replace("\u200c", " ")
+      .replace("ي", "ی")
+      .replace("ك", "ک")
+      .replace("ـ", "");
+  }
+
+  public void addWord(String word) {
+    swearWords.add(word.trim());
+  }
+
+  public void addWords(String... words) {
+    swearWords.addAll(List.of(words));
+  }
+
+  public void removeWord(String word) {
+    swearWords.remove(word.trim());
+  }
+
+  public void removeWords(String... words) {
+    swearWords.removeAll(List.of(words));
+  }
+
+  public boolean isBad(String word) {
+    return swearWords.contains(clearWord(word));
+  }
+
+  public boolean hasSwear(String text) {
+    List<String> splitText = List.of(text.split(" "));
+
+    for (String word : splitText) {
+      if (swearWords.contains(clearWord(word))) {
+        return true;
+      }
     }
 
-    public void removeWord(String word) {
-        swearWords.remove(word.trim());
-    }
+    return false;
+  }
 
-    public void removeWords(String[] words) {
-        swearWords.removeAll(List.of(words));
-    }
+  public String filterWords(String text, String symbol) {
+    List<String> splitText = new ArrayList<>(List.of(text.split(" ")));
 
-    public boolean isBad(String word) {
-        return swearWords.contains(clearWord(word));
+    for (int i = 0; i < splitText.size(); i++) {
+      String word = splitText.get(i);
+      if (swearWords.contains(clearWord(word))) {
+        splitText.set(i, symbol);
+      }
     }
 
-    public boolean hasSwear(String text) {
-        List<String> splitedText = List.of(text.split(" "));
-
-         for (String word : splitedText)
-             if (swearWords.contains(clearWord(word)))
-                 return true;
+    return String.join(" ", splitText);
+  }
 
-        return false;
-    }
-
-    public String filterWords(String text, String symbol) {
-        List<String> splitedText = new ArrayList<>(List.of(text.split(" ")));
-
-        for (String word : splitedText)
-            if (swearWords.contains(clearWord(word)))
-                splitedText.set(splitedText.indexOf(word), symbol);
-
-        return String.join(" ", splitedText);
-    }
-
-    public String filterWords(String text) {
-         return filterWords(text, "*");
-    }
+  public String filterWords(String text) {
+    return filterWords(text, "*");
+  }
 }