Palindrome String Programming Challenge

Problem

Decide whether text is a palindrome, considering only letters and digits and ignoring case.

Implement is_palindrome(text).

text: The text to check (ASCII characters).

Return true for a palindrome, otherwise false.

0 ≤ length ≤ 10,000

Example 1

Input:
text = "Racecar"

Expected output:
expected = True

Input:
std::string text = "Racecar";

Expected output:
bool expected = true;

Input:
string text = "Racecar";

Expected output:
bool expected = true;

Lowercased, "racecar" reads the same both ways.

Example 2

Input:
text = "hello"

Expected output:
expected = False

Input:
std::string text = "hello";

Expected output:
bool expected = false;

Input:
string text = "hello";

Expected output:
bool expected = false;

"hello" backwards is "olleh", which is different.

This challenge is adapted for CodeUtility. Follow the statement and constraints above.