diff --git a/example/controllers/AddController.py b/example/controllers/AddController.py
index 5f5ddf6..bf2b01c 100644
--- a/example/controllers/AddController.py
+++ b/example/controllers/AddController.py
@@ -2,49 +2,67 @@
 from tkinter.constants import END
 from models.Customers import Customers
 from core.Controller import Controller
-
+from src.utils import (
+    seconds_to_readable_time,
+    format_bytes,
+    format_percentage_change,
+    free_up_disk_space,
+    get_start_end_of_week_by_offset,
+)
 
 """
     Responsible for AddView behavior.
 """
+
+
 class AddController(Controller):
-    #-----------------------------------------------------------------------
+    # -----------------------------------------------------------------------
     #        Constructor
-    #-----------------------------------------------------------------------
+    # -----------------------------------------------------------------------
     def __init__(self):
         self.addView = self.loadView("add")
         self.customers = Customers()
-        
-        
-    #-----------------------------------------------------------------------
+
+    # -----------------------------------------------------------------------
     #        Methods
-    #-----------------------------------------------------------------------
+    # -----------------------------------------------------------------------
     """
         Clear all fields of AddView
         
         @param fields Fields to be cleared
     """
+
     def btn_clear(self, fields):
         for field in fields:
             field.delete(0, END)
-            
+
     """
         Adds a new customer with field data
         
         @param fields Fields with customer data
     """
+
     def btn_add(self, fields):
         response = self.customers.add(fields)
-        
+
         if response > 0:
             messagebox.showinfo("Add customer", "Customer successfully added!")
         else:
             messagebox.showerror("Add customer", "Error while adding customer")
-            
+
         self.addView.close()
-        
+
+    def test(self, fields):
+        getAll = self.customers.getAll()
+        sec = seconds_to_readable_time(1)
+        format_bytes(123)
+        format_percentage_change(1, 2)
+        free_up_disk_space(None)
+        get_start_end_of_week_by_offset(None)
+
     """
         @Override
     """
+
     def main(self):
-        self.addView.main()
\ No newline at end of file
+        self.addView.main()
diff --git a/src/utils.py b/src/utils.py
new file mode 100644
index 0000000..0c9b856
--- /dev/null
+++ b/src/utils.py
@@ -0,0 +1,106 @@
+import shutil
+import os
+
+from datetime import datetime, timedelta
+
+
+def seconds_to_readable_time(seconds):
+    if not seconds:
+        return None
+    """
+    Convert milliseconds to readable time
+    """
+    minutes = seconds // 60
+    hours = minutes // 60
+
+    seconds = seconds % 60
+    minutes = minutes % 60
+
+    time_string = ""
+
+    if hours > 0:
+        time_string += f"{round(hours)}h"
+    if minutes > 0:
+        time_string += f"{round(minutes)}m"
+    if seconds > 0 or time_string == "":
+        time_string += f"{round(seconds)}s"
+
+    return time_string
+
+
+def format_percentage_change(daily_value, prev_period_value):
+    if not daily_value or not prev_period_value:
+        return None
+    if prev_period_value == 0:
+        if daily_value > 0:
+            return "(➚100%)"
+        elif daily_value < 0:
+            return "(➘100%)"
+        else:
+            return "(≈0%)"
+
+    difference = ((daily_value - prev_period_value) / prev_period_value) * 100
+    if difference >= 0.1:
+        return f"(➚{difference:.1f}%)"
+    elif difference < 0:
+        return f"(➘{abs(difference):.1f}%)"
+    else:
+        return "(≈0%)"
+
+
+def get_start_end_of_week_by_offset(week_offset) -> tuple:
+    if not week_offset:
+        return None
+    """
+    Returns the start (Monday) and end (Sunday) dates of the week determined by a given week offset
+    relative to the current date.
+    Args:
+        week_offset (int): The offset (number of weeks) from the current week.
+            - week_offset = 0: The current week.
+            - week_offset = 1: The previous week.
+            - week_offset = -1: The next week.
+    Returns:
+        tuple: A tuple containing the start (Monday) and end (Sunday) dates of the specified week in 'YYYY-MM-DD' format.
+    """
+    today = datetime.today()
+    start_of_week = (
+        today - timedelta(days=today.weekday()) - timedelta(weeks=week_offset)
+    )
+    end_of_week = start_of_week + timedelta(days=6)
+    return start_of_week, end_of_week
+
+
+def free_up_disk_space(to_remove: str):
+    if not to_remove:
+        return None
+    print("Cleaning up...", to_remove)
+    try:
+        if os.path.isdir(to_remove):
+            shutil.rmtree(to_remove)
+            print(f"Folder {to_remove} has been removed.")
+        elif os.path.isfile(to_remove):
+            os.remove(to_remove)
+            print(f"File {to_remove} has been removed.")
+    except FileNotFoundError:
+        print(f"{to_remove} not found.")
+    except Exception as e:
+        print(f"An error occurred: {e}")
+
+
+def format_bytes(bytes) -> str:
+    if not bytes:
+        return None
+
+    units = ["TB", "GB", "MB", "KB"]
+    sizes = [
+        1024**4,  # TB
+        1024**3,  # GB
+        1024**2,  # MB
+        1024**1,  # KB
+    ]
+
+    for i in range(len(sizes)):
+        if bytes >= sizes[i]:
+            return f"{(bytes / sizes[i]):.2f} {units[i]}"
+
+    return f"{bytes} B"  # For values smaller than 1 KB