diff --git a/Week04/functions_hatice_akgul.py b/Week04/functions_hatice_akgul.py
new file mode 100644
index 00000000..c144654c
--- /dev/null
+++ b/Week04/functions_hatice_akgul.py
@@ -0,0 +1,35 @@
+import inspect
+
+# 1. custom_power: lambda function with positional-only x
+custom_power = lambda x=0, /, e=1: x**e
+
+# 2. custom_equation: positional-only, positional-or-keyword, and keyword-only params
+def custom_equation(x: int = 0, y: int = 0, /, a: int = 1, b: int = 1, *, c: int = 1) -> float:
+    """
+    Calculates (x**a + y**b) / c with specific parameter constraints.
+
+    :param x: Base 1, positional-only
+    :param y: Base 2, positional-only
+    :param a: Exponent 1, positional-or-keyword
+    :param b: Exponent 2, positional-or-keyword
+    :param c: Divisor, keyword-only
+    :returns: Result as float
+    """
+    return float((x**a + y**b) / c)
+
+# 3. fn_w_counter: tracks total calls and caller names
+def fn_w_counter() -> tuple[int, dict]:
+    """
+    Counts the number of calls and tracks the caller (__name__).
+    """
+    if not hasattr(fn_w_counter, "calls"):
+        fn_w_counter.calls = 0
+        fn_w_counter.callers = {}
+
+    caller_frame = inspect.currentframe().f_back
+    caller_name = caller_frame.f_globals.get('__name__', 'unknown')
+
+    fn_w_counter.calls += 1
+    fn_w_counter.callers[caller_name] = fn_w_counter.callers.get(caller_name, 0) + 1
+
+    return (fn_w_counter.calls, fn_w_counter.callers)