add solution of is_palindrome

Cargo.toml

@@ -1,10 +1,12 @@
 [workspace.lints.clippy]
-pedantic = "warn"
-nursery = "warn"
+nursery = { level = "warn", priority = -1 }
+pedantic = { level = "warn", priority = -1 }
+needless_pass_by_value = "allow"
 
 [workspace]
 members = [
 	"crates/contains_duplicate",
+	"crates/is_palindrome",
 	"crates/two_sum",
 	"crates/valid_anagram",
 ]

crates/is_palindrome/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "is_palindrome"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+
+[lints]
+workspace = true

crates/is_palindrome/src/lib.rs

@@ -0,0 +1,57 @@
+#[must_use]
+pub fn is_palindrome(s: String) -> bool {
+	if s.trim().is_empty() {
+		return true;
+	}
+
+	let bytes = s.as_bytes();
+
+	let mut left_pointer = 0;
+	let mut right_pointer = bytes.len() - 1;
+
+	while left_pointer < right_pointer {
+		if !bytes[left_pointer].is_ascii_alphanumeric() {
+			left_pointer += 1;
+			continue;
+		}
+
+		if !bytes[right_pointer].is_ascii_alphanumeric() {
+			right_pointer -= 1;
+			continue;
+		}
+
+		if bytes[left_pointer].to_ascii_lowercase() != bytes[right_pointer].to_ascii_lowercase() {
+			return false;
+		}
+
+		left_pointer += 1;
+		right_pointer -= 1;
+	}
+
+	true
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn case_1() {
+		assert!(is_palindrome(String::from("A man, a plan, a canal: Panama")));
+	}
+
+	#[test]
+	fn case_2() {
+		assert!(!is_palindrome(String::from("race a car")));
+	}
+
+	#[test]
+	fn case_3() {
+		assert!(is_palindrome(String::from(" ")));
+	}
+
+	#[test]
+	fn case_4() {
+		assert!(is_palindrome(String::from("f f")));
+	}
+}

crates/valid_anagram/src/lib.rs

@@ -1,7 +1,6 @@
 use std::collections::HashMap;
 
 #[must_use]
-#[allow(clippy::needless_pass_by_value)]
 pub fn is_anagram(s: String, t: String) -> bool {
 	if s.len() != t.len() {
 		return false;