diff --git a/REadME.md b/REadME.md
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+mini-bookmark V2
+
+A CLI tool to save and manage web URLs, developed as part of a university assignment at Samsun Üniversitesi.
+
+Student Information
+
+Name: Hüdanur Şener
+
+Student ID: 251478066
+
+Overview
+
+mini-bookmark is a lightweight command-line interface tool that allows users to store, list, search, and delete web bookmarks. All data is persisted in a plain text file (links.dat) located within a hidden .minibookmark/ directory.
+
+V1 vs V2: What's New?
+
+The project has evolved from V1 to V2 with the following key improvements:
+
+Command Completion: In V1, list and delete were placeholders. In V2, they are fully functional.
+
+URL Validation: V2 introduces a safety check ensuring all added URLs start with 'http' or 'https'.
+
+Formatted Output: The list command now presents data in a clean, professional table format.
+
+Enhanced Error Handling: Improved feedback for missing arguments, invalid IDs, and uninitialized states.
+
+V2 Task List
+
+List Command: Implemented full listing of bookmarks with a formatted header and aligned columns.
+
+Delete Command: Added functionality to remove a specific bookmark entry using its ID number.
+
+Validation Logic: Integrated a prefix check for URLs to prevent malformed data entry.
+
+Installation \& Usage
+
+1\. Initialize the Project
+
+python minibookmark.py init
+
+2\. Add a Bookmark
+
+python minibookmark.py add "Google" "https://google.com"
+
+3\. List All Bookmarks
+
+python minibookmark.py list
+
+4\. Search Bookmarks
+
+python minibookmark.py search "keyword"
+
+5\. Delete a Bookmark
+
+python minibookmark.py delete <id>
+
+Data Format
+
+Data is stored in .minibookmark/links.dat using the following structure:
+
+id|title|url|date
+
+License
+
+Educational purpose only.
+
+
+
diff --git a/problems/mini-bookmark/SPEC-v1.txt b/problems/mini-bookmark/SPEC-v1.txt
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@@ -0,0 +1,49 @@
+PROJECT: mini-bookmark
+AUTHOR: Hüdanur Şener (251478066)
+VERSION: v0
+DATE: 2026-03-16
+
+========================================
+OVERVIEW
+========================================
+mini-bookmark is a CLI tool to save and manage web URLs.
+It stores bookmarks in a plain text file.
+All data is kept in a directory named .minibookmark/
+
+========================================
+COMMANDS
+========================================
+
+--- init ---
+Usage: python minibookmark.py init
+Creates .minibookmark/ directory and an empty links.dat file.
+If it exists, prints "Already initialized."
+
+--- add ---
+Usage: python minibookmark.py add "Google" "https://google.com"
+Saves a new bookmark with an auto-increment ID.
+Format: id|title|url|date
+Prints: "Added bookmark #<id>: <title>"
+
+--- list ---
+Usage: python minibookmark.py list
+(To be implemented)
+Will show all saved bookmarks.
+
+--- delete ---
+Usage: python minibookmark.py delete <id>
+(To be implemented)
+Will remove a bookmark by ID.
+
+========================================
+DATA FORMAT
+========================================
+File: .minibookmark/links.dat
+Format: id|title|url|2026-03-16
+
+========================================
+ERROR HANDLING
+========================================
+- Running without init: "Not initialized. Run: python minibookmark.py init"
+- Unknown command: "Unknown command: <command>"
+- Missing arguments: "Usage: python minibookmark.py <command> [args]"
diff --git a/problems/mini-bookmark/SPEC-v2.txt b/problems/mini-bookmark/SPEC-v2.txt
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+PROJECT: mini-bookmark
+AUTHOR: Hüdanur Şener (251478066)
+VERSION: v1
+DATE: 2026-03-29
+
+========================================
+OVERVIEW
+========================================
+mini-bookmark is a CLI tool to save and manage web URLs.
+It stores bookmarks in a plain text file. [cite: 2]
+All data is kept in a directory named .minibookmark/
+
+========================================
+COMMANDS
+========================================
+
+--- init ---
+Usage: python minibookmark.py init
+Creates .minibookmark/ directory and an empty links.dat file.
+If it exists, prints "Already initialized." [cite: 3]
+
+--- add ---
+Usage: python minibookmark.py add "Title" "URL"
+Saves a new bookmark with an auto-increment ID. [cite: 4]
+Format: id|title|url|date
+Prints: "Added bookmark #<id>: <title>"
+
+--- list ---
+Usage: python minibookmark.py list
+(To be implemented)
+Will show all saved bookmarks.
+
+--- delete ---
+Usage: python minibookmark.py delete <id>
+(To be implemented)
+Will remove a bookmark by ID. [cite: 5]
+
+--- search ---
+Usage: python minibookmark.py search <keyword>
+(V1 Update) Searches for bookmarks by title keyword.
+[Note: This command was added to meet Assignment 4.2 requirements.]
+
+========================================
+DATA FORMAT
+========================================
+File: .minibookmark/links.dat
+Format: id|title|url|2026-03-16 [cite: 6]
+
+========================================
+ERROR HANDLING
+========================================
+- Running without init: "Not initialized. Run: python minibookmark.py init"
+- Unknown command: "Unknown command: <command>"
+- Missing arguments: "Usage: python minibookmark.py <command> [args]"
\ No newline at end of file
diff --git a/problems/mini-bookmark/SPEC-v3.txt b/problems/mini-bookmark/SPEC-v3.txt
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+++ b/problems/mini-bookmark/SPEC-v3.txt
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+PROJECT: mini-bookmark
+AUTHOR: Hüdanur Şener (251478066)
+VERSION: v3
+DATE: 2026-04-20
+
+========================================
+OVERVIEW
+========================================
+mini-bookmark is a CLI tool to save and manage web URLs[cite: 13].
+It stores bookmarks in a plain text file. 
+All data is kept in a directory named .minibookmark/[cite: 14].
+
+========================================
+COMMANDS
+========================================
+
+--- init ---
+Usage: python minibookmark.py init
+Creates .minibookmark/ directory and an empty links.dat file[cite: 15].
+If it exists, prints "Already initialized."
+
+--- add ---
+Usage: python minibookmark.py add "Title" "URL"
+(V2 Update) Saves a new bookmark with an auto-increment ID. 
+URL must start with "http" or "https"[cite: 16].
+Format: id|title|url|date
+Prints: "Added bookmark #<id>: <title>"
+
+--- list ---
+Usage: python minibookmark.py list
+(V2 Update: Implemented) Shows all saved bookmarks in a formatted table[cite: 17].
+Displays ID, Title, URL, and Date columns.
+
+--- delete ---
+Usage: python minibookmark.py delete <id>
+(V2 Update: Implemented) Removes a bookmark by its specific ID from links.dat[cite: 18].
+Prints: "Bookmark #<id> deleted." if successful.
+
+--- search ---
+Usage: python minibookmark.py search <keyword>
+Searches for bookmarks by title keyword (Case-insensitive)[cite: 19].
+
+========================================
+DATA FORMAT
+========================================
+File: .minibookmark/links.dat
+Format: id|title|url|YYYY-MM-DD
+Example: 1|Google|http://google.com|2026-04-20
+
+========================================
+ERROR HANDLING
+========================================
+- Running without init: "Not initialized. Run: python minibookmark.py init"
+- Unknown command: "Unknown command: <command>"
+- Missing arguments: "Usage: python minibookmark.py <command> [args]"
+- Invalid URL (V2): "Error: URL must start with 'http' or 'https'."
+- ID Not Found (V2): "Bookmark #<id> not found."
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diff --git a/problems/mini-bookmark/TEST-v1 (2).py b/problems/mini-bookmark/TEST-v1 (2).py
new file mode 100644
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+++ b/problems/mini-bookmark/TEST-v1 (2).py	
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+"""
+mini-bookmark SPEC test cases
+Student:Hüdanur Şener (251478066)
+Project: mini-bookmark
+"""
+import subprocess
+import os
+import shutil
+
+# --- Helper Function ---
+def run_cmd(args):
+    """Runs the script and returns the output."""
+    result = subprocess.run(
+        ["python", "minibookmark.py"] + args,
+        capture_output=True,
+        text=True
+    )
+    return result.stdout.strip()
+
+def setup_function():
+    """Clean start for each test."""
+    if os.path.exists(".minibookmark"):
+        shutil.rmtree(".minibookmark")
+
+# --- 1. init COMMAND TESTS ---
+def test_init_creates_directory():
+    # Normal durum: İlk kez init yapilir
+    run_cmd(["init"])
+    assert os.path.exists(".minibookmark") == True
+
+def test_init_already_initialized():
+    # Hata durumu: Zaten init yapilmisken tekrar yapilir
+    run_cmd(["init"])
+    output = run_cmd(["init"])
+    assert "Already initialized" in output
+
+# --- 2. add COMMAND TESTS ---
+def test_add_single_bookmark():
+    # Normal durum: Bir link basariyla eklenir
+    run_cmd(["init"])
+    output = run_cmd(["add", "Google", "https://google.com"])
+    assert "Added bookmark #1" in output
+
+def test_add_multiple_bookmarks():
+    # Normal durum: İkinci link eklenir ve ID artar
+    run_cmd(["init"])
+    run_cmd(["add", "A", "a.com"])
+    output = run_cmd(["add", "B", "b.com"])
+    assert "#2" in output
+
+def test_add_missing_arguments():
+    # Hata durumu: Eksik arguman (sadece isim)
+    run_cmd(["init"])
+    output = run_cmd(["add", "OnlyName"])
+    assert "Usage" in output
+
+# --- 3. ERROR HANDLING & FLOW TESTS ---
+def test_command_before_init():
+    # Hata durumu: Klasor yokken add komutu calismaz
+    output = run_cmd(["add", "Test", "test.com"])
+    assert "Not initialized" in output
+
+def test_unknown_command_error():
+    # Hata durumu: SPEC'te olmayan bir komut
+    run_cmd(["init"])
+    output = run_cmd(["jump"])
+    assert "Unknown command" in output
+
+# --- 4. FUTURE IMPLEMENTATION TESTS (SPEC Status) ---
+def test_list_not_implemented_yet():
+    # SPEC Uyumu: list komutu henuz hazir degil mesaji vermeli
+    run_cmd(["init"])
+    output = run_cmd(["list"])
+    assert "future weeks" in output
+
+def test_delete_not_implemented_yet():
+    # SPEC Uyumu: delete komutu henuz hazir degil mesaji vermeli
+    run_cmd(["init"])
+    output = run_cmd(["delete", "1"])
+    assert "future weeks" in output
+
+# --- 5. USAGE TESTS ---
+def test_no_arguments_usage():
+    # Hata durumu: Hicbir arguman girilmezse kullanim kilavuzu basilir
+    output = run_cmd([])
+    assert "Usage" in output
\ No newline at end of file
diff --git a/problems/mini-bookmark/TEST-v2.py b/problems/mini-bookmark/TEST-v2.py
new file mode 100644
index 00000000..e8049af7
--- /dev/null
+++ b/problems/mini-bookmark/TEST-v2.py
@@ -0,0 +1,92 @@
+"""
+PROJECT: mini-bookmark V1
+STUDENT: Hüdanur Şener (251478066)
+
+V1 GÖREV LİSTESİ (Ödev 4.2 Gereksinimi):
+1. 'init' komutu tamamlandı: .minibookmark/ klasörü ve veri dosyası oluşturuluyor.
+2. 'add' komutu id|title|url|date formatında kayıt yapacak şekilde geliştirildi.
+3. 'search' komutu Codex desteğiyle ek puan görevi olarak projeye eklendi.
+"""
+
+import sys
+import os
+
+# Veri saklama yolları [cite: 2, 6]
+DB_DIR = ".minibookmark"
+DB_FILE = os.path.join(DB_DIR, "links.dat")
+
+
+def init():
+    """Projeyi başlatır ve gerekli dosyayı oluşturur[cite: 3]."""
+    if os.path.exists(DB_DIR):
+        print("Already initialized.")
+    else:
+        os.makedirs(DB_DIR)
+        open(DB_FILE, "w").close()
+        print("Project initialized.")
+
+
+def add(title, url):
+    """Yeni bir bookmark ekler[cite: 4]."""
+    if not os.path.exists(DB_DIR):
+        print("Not initialized. Run: python minibookmark.py init")
+    else:
+        try:
+            with open(DB_FILE, "r") as f:
+                new_id = len(f.readlines()) + 1
+        except FileNotFoundError:
+            new_id = 1
+
+        date_str = "2026-03-16"  # SPEC'teki sabit tarih formatı [cite: 6]
+        entry = f"{new_id}|{title}|{url}|{date_str}\n"
+
+        with open(DB_FILE, "a") as f:
+            f.write(entry)
+        print(f"Added bookmark #{new_id}: {title}")
+
+
+def search(keyword):
+    """BONUS: Codex ile üretilen arama fonksiyonu[cite: 42]."""
+    if not os.path.exists(DB_FILE):
+        print("Not initialized.")
+        return
+    with open(DB_FILE, "r") as f:
+        found = False
+        for line in f:
+            if keyword.lower() in line.split('|')[1].lower():
+                print(line.strip())
+                found = True
+        if not found:
+            print("No bookmarks found.")
+
+
+def main():
+    args = sys.argv[1:]
+
+    if not args:
+        print("Usage: python minibookmark.py <command> [args]")
+        return
+
+    command = args[0]
+
+    if command == "init":
+        init()
+    elif command == "add":
+        if len(args) < 3:
+            print("Usage: python minibookmark.py add <title> <url>")
+        else:
+            add(args[1], args[2])
+    elif command == "search":
+        if len(args) < 2:
+            print("Usage: python minibookmark.py search <keyword>")
+        else:
+            search(args[1])
+    elif command in ["list", "delete"]:
+        # Gelecek haftalar için yer tutucu mesaj
+        print("This feature will be implemented in future weeks.")
+    else:
+        print(f"Unknown command: {command}")
+
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file
diff --git a/problems/mini-bookmark/TEST-v3.py b/problems/mini-bookmark/TEST-v3.py
new file mode 100644
index 00000000..d08b9a54
--- /dev/null
+++ b/problems/mini-bookmark/TEST-v3.py
@@ -0,0 +1,142 @@
+"""
+PROJECT: mini-bookmark V3
+AUTHOR: Hüdanur Şener (251478066)
+DATE: 2026-04-20
+
+V2 TASK LIST:
+1. 'list' command completed: Displays all records in a formatted table.
+2. 'delete' command implemented: Added logic to remove a record by ID.
+3. URL Validation: Added a check to ensure links start with 'http'.
+"""
+
+import sys
+import os
+
+# Data storage paths [cite: 14]
+DB_DIR = ".minibookmark"
+DB_FILE = os.path.join(DB_DIR, "links.dat")
+
+
+def init():
+    """Initializes the project and creates necessary directory/file[cite: 15]."""
+    if os.path.exists(DB_DIR):
+        print("Already initialized.")
+    else:
+        os.makedirs(DB_DIR)
+        open(DB_FILE, "w").close()
+        print("Project initialized.")
+
+
+def add(title, url):
+    """Adds a new bookmark with URL validation[cite: 16]."""
+    if not url.startswith("http"):
+        print("Error: URL must start with 'http' or 'https'.")
+        return
+
+    if not os.path.exists(DB_DIR):
+        print("Not initialized. Run: python minibookmark.py init")
+        return
+
+    try:
+        with open(DB_FILE, "r") as f:
+            lines = f.readlines()
+            new_id = len(lines) + 1
+    except FileNotFoundError:
+        new_id = 1
+
+    date_str = "2026-04-20"
+    entry = f"{new_id}|{title}|{url}|{date_str}\n"
+
+    with open(DB_FILE, "a") as f:
+        f.write(entry)
+    print(f"Added bookmark #{new_id}: {title}")
+
+
+def list_bookmarks():
+    """V2: Lists all saved bookmarks in a clean format."""
+    if not os.path.exists(DB_FILE) or os.path.getsize(DB_FILE) == 0:
+        print("No bookmarks found.")
+        return
+
+    # Table Header
+    print(f"{'ID':<4} | {'TITLE':<20} | {'URL':<30} | {'DATE'}")
+    print("-" * 75)
+    with open(DB_FILE, "r") as f:
+        for line in f:
+            parts = line.strip().split('|')
+            if len(parts) == 4:
+                print(f"{parts[0]:<4} | {parts[1]:<20} | {parts[2]:<30} | {parts[3]}")
+
+
+def delete(bookmark_id):
+    """V2: Removes a bookmark based on its ID."""
+    if not os.path.exists(DB_FILE):
+        print("Not initialized.")
+        return
+
+    lines = []
+    found = False
+    with open(DB_FILE, "r") as f:
+        lines = f.readlines()
+
+    with open(DB_FILE, "w") as f:
+        for line in lines:
+            # Check if the line starts with the target ID
+            if not line.startswith(f"{bookmark_id}|"):
+                f.write(line)
+            else:
+                found = True
+
+    if found:
+        print(f"Bookmark #{bookmark_id} deleted successfully.")
+    else:
+        print(f"Error: Bookmark #{bookmark_id} not found.")
+
+
+def search(keyword):
+    """Searches for bookmarks by title keyword[cite: 18]."""
+    if not os.path.exists(DB_FILE):
+        print("Not initialized.")
+        return
+    with open(DB_FILE, "r") as f:
+        found = False
+        for line in f:
+            if keyword.lower() in line.split('|')[1].lower():
+                print(line.strip())
+                found = True
+        if not found:
+            print("No bookmarks found matching the keyword.")
+
+
+def main():
+    args = sys.argv[1:]
+    if not args:
+        print("Usage: python minibookmark.py <command> [args]")
+        return
+
+    command = args[0]
+    if command == "init":
+        init()
+    elif command == "add":
+        if len(args) < 3:
+            print("Usage: python minibookmark.py add <title> <url>")
+        else:
+            add(args[1], args[2])
+    elif command == "list":
+        list_bookmarks()
+    elif command == "delete":
+        if len(args) < 2:
+            print("Usage: python minibookmark.py delete <id>")
+        else:
+            delete(args[1])
+    elif command == "search":
+        if len(args) < 2:
+            print("Usage: python minibookmark.py search <keyword>")
+        else:
+            search(args[1])
+    else:
+        print(f"Unknown command: {command}")
+
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file
diff --git a/problems/mini-bookmark/solution_v0.py b/problems/mini-bookmark/solution_v0.py
new file mode 100644
index 00000000..e4bc768e
--- /dev/null
+++ b/problems/mini-bookmark/solution_v0.py
@@ -0,0 +1,82 @@
+"""
+mini-bookmark v0 — Basitlestirilmis implementasyon
+Ogrenci: Hüdanur Şener (251478066)
+Proje: mini-bookmark
+
+Kapsam: Sadece init ve add komutlari.
+Sinirlamalar: Dongu (for/while) ve liste ([]) kesinlikle kullanilmadi.
+"""
+import sys
+import os
+
+
+def initialize():
+    """Bookmark dizini ve bos veri dosyasini olusturur."""
+    if os.path.exists(".minibookmark"):
+        return "Already initialized."
+
+    os.mkdir(".minibookmark")
+    # Bos bir dosya acip kapatmak onu olusturmak demektir
+    f = open(".minibookmark/links.dat", "w")
+    f.close()
+    return "Initialized empty bookmark folder."
+
+
+def add_bookmark(title, url):
+    """Yeni bir link ekler. ID tespiti satir sayilarini sayarak yapilir."""
+    # Klasor yoksa hata dondur
+    if not os.path.exists(".minibookmark"):
+        return "Not initialized. Run: python minibookmark.py init"
+
+    # Mevcut dosyayi oku (ID tespiti icin)
+    f = open(".minibookmark/links.dat", "r")
+    content = f.read()
+    f.close()
+
+    # YASAK: Dongu ve liste kullanmadan satir sayisi bulma:
+    # Dosyadaki her '\n' (yeni satir) karakteri bir kaydi temsil eder.
+    bookmark_id = content.count("\n") + 1
+
+    # Dosyaya ekleme yap (Append modu)
+    f = open(".minibookmark/links.dat", "a")
+    f.write(str(bookmark_id) + "|" + title + "|" + url + "|2026-03-16\n")
+    f.close()
+
+    return "Added bookmark #" + str(bookmark_id) + ": " + title
+
+
+def show_not_implemented(command_name):
+    """Henuz kodlanmamis ozellikler icin standart bir mesaj dondurur."""
+    return "Command '" + command_name + "' will be implemented in future weeks."
+
+
+# --- Ana Program Akisi ---
+
+# Kullanici hicbir sey yazmadan programi calistirirsa
+if len(sys.argv) < 2:
+    print("Usage: python minibookmark.py <command> [args]")
+
+# init komutu
+elif sys.argv[1] == "init":
+    print(initialize())
+
+# add komutu
+elif sys.argv[1] == "add":
+    # Eger title veya url eksikse (python + dosya_adi + komut + 2 arguman = 4)
+    if len(sys.argv) < 4:
+        print("Usage: python minibookmark.py add <title> <url>")
+    else:
+        # Argumanlari fonksiyonumuza gonderiyoruz
+        print(add_bookmark(sys.argv[2], sys.argv[3]))
+
+# list komutu (Henuz implemente edilmedi)
+elif sys.argv[1] == "list":
+    print(show_not_implemented("list"))
+
+# delete komutu (Henuz implemente edilmedi)
+elif sys.argv[1] == "delete":
+    print(show_not_implemented("delete"))
+
+# Gecersiz bir komut girilirse
+else:
+    print("Unknown command: " + sys.argv[1])
\ No newline at end of file