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

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

@@ -0,0 +1,14 @@
+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}");
+}