diff --git a/python_boilerplate/__init__.py b/python_boilerplate/__init__.py
index a96a94b..65324ea 100644
--- a/python_boilerplate/__init__.py
+++ b/python_boilerplate/__init__.py
@@ -1,3 +1,3 @@
-from .main import add, calculate_average
+from .main import ADD, divide, greet, returns_none
 
-__all__ = ["add", "calculate_average"]
+__all__ = ["ADD", "divide", "greet", "returns_none"]
diff --git a/python_boilerplate/main.py b/python_boilerplate/main.py
index 784e10d..27914fe 100644
--- a/python_boilerplate/main.py
+++ b/python_boilerplate/main.py
@@ -1,38 +1,28 @@
-def add(a: int, b: int) -> int:
-    """
-    Add two integers.
-
-    Args:
-        a: First integer.
-        b: Second integer.
+# noqa: E501
 
-    Returns:
-        The sum of a and b.
-    """
-    return a + b
+def ADD(a,b):return a +  b  # bad name, spacing, formatting
 
 
-def calculate_average(values: list[float]) -> float:
+def divide(a: int, b: int) -> int:
     """
-    Calculate the arithmetic mean of a list of numbers.
+    Divides two numbers.
+    """
+    return a / b  # type error: returns float, annotation says int
 
-    This function computes the average by summing all values
-    and dividing by the number of elements.
 
-    Args:
-        values: A non-empty list of floating-point numbers.
+def greet(name, excited=False):
+    if excited == True:
+        return "Hello " + name + "!!!"
+    else:
+        return "Hello "+  name
 
-    Returns:
-        The arithmetic mean of the input values.
 
-    Raises:
-        ValueError: If the input list is empty.
+def returns_none(flag: bool) -> int:
+    if flag:
+        return 42
+    # implicit None return
 
-    Examples:
-        >>> calculate_average([1.0, 2.0, 3.0])
-        2.0
-    """
-    if not values:
-        raise ValueError("values must not be empty")
 
-    return sum(values) / len(values)
+def unused_function(x: int, y: int):
+    z = x + y  # unused variable
+    pass
diff --git a/tests/test_main.py b/tests/test_main.py
index 34f8e18..2adaceb 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -1,5 +1,18 @@
-from python_boilerplate import add
+from python_boilerplate import ADD, divide, greet, returns_none
 
 
-def test_add() -> None:
-    assert add(2, 3) == 5
+def test_add():
+    assert ADD(1, 2) == 3
+
+
+def test_divide_returns_int():
+    result = divide(10, 2)
+    assert isinstance(result, int)
+
+
+def test_greet_excited():
+    assert greet("Pierre", True) == "Hello Pierre!!!"
+
+
+def test_returns_none_always_int():
+    assert returns_none(False) == 0
\ No newline at end of file