feat(solutions): add triangle-type/rust/function

challenges/triangle-type/solutions/rust/function/Cargo.lock

@@ -0,0 +1,7 @@
+# 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/triangle-type/solutions/rust/function/Cargo.toml

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

challenges/triangle-type/solutions/rust/function/README.md

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

challenges/triangle-type/solutions/rust/function/src/main.rs

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+use std::io;
+
+pub struct Triangle {
+    pub sides: [u32; 3],
+}
+
+impl Triangle {
+    pub fn sides_type(&self) -> String {
+        if (self.sides[0] + self.sides[1] < self.sides[2])
+            || (self.sides[2] + self.sides[0] < self.sides[1])
+            || (self.sides[2] + self.sides[1] < self.sides[0])
+        {
+            return String::from("impossible");
+        }
+        if self.sides[0] == self.sides[1] && self.sides[1] == self.sides[2] {
+            return String::from("equilateral");
+        }
+        if self.sides[0] == self.sides[1]
+            || self.sides[1] == self.sides[2]
+            || self.sides[2] == self.sides[0]
+        {
+            return String::from("isosceles");
+        }
+        return String::from("scalene");
+    }
+
+    pub fn size(&self) -> usize {
+        return self.sides.len();
+    }
+}
+
+fn main() {
+    let mut triangle = Triangle { sides: [0, 0, 0] };
+    for index in 0..triangle.size() {
+        let mut side = String::new();
+        io::stdin()
+            .read_line(&mut side)
+            .expect("Failed to read `stdin` line.");
+        let side: u32 = side
+            .trim()
+            .parse()
+            .expect("Failed to convert `side` as an `u32`.");
+        triangle.sides[index] = side;
+    }
+    println!("{}", triangle.sides_type());
+}