feat(solutions): add is-palindrome/rust/function

challenges/is-palindrome/solutions/rust/function/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust_application"
+version = "1.0.0"

challenges/is-palindrome/solutions/rust/function/Cargo.toml

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+[package]
+name = "rust_application"
+version = "1.0.0"
+edition = "2021"
+
+[dependencies]

challenges/is-palindrome/solutions/rust/function/README.md

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+# is-palindrome/rust/function
+
+Created by [@Divlo](https://github.com/Divlo) on 4 January 2023.

challenges/is-palindrome/solutions/rust/function/src/main.rs

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+use std::io;
+
+fn main() {
+    let mut string = String::new();
+    io::stdin()
+        .read_line(&mut string)
+        .expect("Failed to read `stdin` line.");
+    let string = string.trim().replace(" ", "").to_lowercase();
+    let mut reverse: Vec<char> = string.chars().collect();
+    reverse.reverse();
+    let reverse: String = reverse.into_iter().collect();
+    let is_palindrome = reverse == string;
+    println!("{is_palindrome}");
+}