feat(solutions): add fizzbuzz/rust/function

challenges/fizzbuzz/solutions/rust/function/src/main.rs

@@ -0,0 +1,25 @@
+use std::io;
+
+fn main() {
+    let mut length = String::new();
+    io::stdin()
+        .read_line(&mut length)
+        .expect("Failed to read `stdin` line.");
+    let length: usize = length
+        .trim()
+        .parse()
+        .expect("Failed to convert `length` as an `usize`.");
+    for number in 1..=length {
+        let is_divisible_by_3 = number % 3 == 0;
+        let is_divisible_by_5 = number % 5 == 0;
+        if is_divisible_by_3 && is_divisible_by_5 {
+            println!("FizzBuzz");
+        } else if is_divisible_by_3 {
+            println!("Fizz");
+        } else if is_divisible_by_5 {
+            println!("Buzz");
+        } else {
+            println!("{number}");
+        }
+    }
+}