[feature] Add extended math and string fns

[pushpitkamboj]

added the math and string manipulation functions. Fixes #1

[Copilot]

Pull request overview

Adds beginner-friendly math and string utility functions to pushpit/main.py and updates the demo main() output to showcase them (per Issue #1).

Changes:

• Added average, factorial, min/max, reverse string, and palindrome helper functions.
• Expanded main() to print a structured demo of the new math and string operations.

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[Copilot]

In main(), the loop for word in test_words: reuses the word variable name that was just used for the earlier string example. Using a different loop variable name (e.g., test_word) would avoid shadowing and be clearer for beginners.

Suggested change

	for word in test_words:
	result = "is" if is_palindrome(word) else "is not"
	print(f" '{word}' {result} a palindrome")
	for test_word in test_words:
	result = "is" if is_palindrome(test_word) else "is not"
	print(f" '{test_word}' {result} a palindrome")

[Copilot]

calculate_average returns 0.0 for an empty list, which is not a meaningful average and is inconsistent with find_max/find_min returning None on empty input. Consider making the empty-input behavior explicit (e.g., raise ValueError, or return None and change the return type to Optional[float]).

Suggested change

	"""Calculate the average of a list of numbers."""
	if not numbers:
	return 0.0
	"""Calculate the average of a list of numbers.
	Raises:
	ValueError: If the list of numbers is empty.
	"""
	if not numbers:
	raise ValueError("Cannot calculate average of an empty list")

[Copilot]

factorial is implemented recursively, which will raise RecursionError for larger n due to Python's recursion limit. An iterative implementation avoids that failure mode while keeping the function beginner-friendly.

Suggested change

	"""Calculate factorial of a number recursively."""
	if n < 0:
	raise ValueError("Factorial is not defined for negative numbers")
	if n <= 1:
	return 1
	return n * factorial(n - 1)
	"""Calculate factorial of a number iteratively."""
	if n < 0:
	raise ValueError("Factorial is not defined for negative numbers")
	if n <= 1:
	return 1
	result = 1
	for i in range(2, n + 1):
	result *= i
	return result

[Copilot]

There is trailing whitespace on this blank line, which can cause noisy diffs and linting failures. Remove the spaces so the line is empty.

Suggested change