feat(solutions): add ascii-art/rust/function

challenges/ascii-art/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/ascii-art/solutions/rust/function/Cargo.toml

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

challenges/ascii-art/solutions/rust/function/README.md

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

challenges/ascii-art/solutions/rust/function/src/main.rs

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+use std::{collections::HashMap, io};
+
+fn main() {
+    let mut width = String::new();
+    io::stdin()
+        .read_line(&mut width)
+        .expect("Failed to read `stdin` line.");
+    let width: usize = width
+        .trim()
+        .parse()
+        .expect("Failed to convert `width` as an `usize`.");
+
+    let mut height = String::new();
+    io::stdin()
+        .read_line(&mut height)
+        .expect("Failed to read `stdin` line.");
+    let height: usize = height
+        .trim()
+        .parse()
+        .expect("Failed to convert `height` as an `usize`.");
+
+    let mut text = String::new();
+    io::stdin()
+        .read_line(&mut text)
+        .expect("Failed to read `stdin` line.");
+    let text = text.trim();
+
+    let characters = [
+        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
+        'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '?',
+    ];
+
+    // "ABCDEFGHIJKLMNOPQRSTUVWXYZ?" Represented in ASCII art.
+    // key = character ; value = character represented in ASCII art line by line
+    let mut characters_ascii: HashMap<char, Vec<String>> = HashMap::new();
+
+    for character in characters {
+        let value = vec![];
+        characters_ascii.insert(character, value);
+    }
+
+    for _ in 0..height {
+        let mut row = String::new();
+        io::stdin()
+            .read_line(&mut row)
+            .expect("Failed to read `stdin` line.");
+        let mut character_index: usize = 0;
+        let mut character_ascii_index: usize = 0;
+        let mut row_ascii = String::new();
+        for (_, character) in row.char_indices() {
+            let is_last = character_ascii_index == width - 1;
+            if is_last {
+                row_ascii.push(character);
+                let row_ascii_value = row_ascii.clone();
+                row_ascii.clear();
+                characters_ascii
+                    .get_mut(&characters[character_index])
+                    .unwrap()
+                    .push(row_ascii_value);
+                character_index += 1;
+                character_ascii_index = 0;
+            } else {
+                row_ascii.push(character);
+                character_ascii_index += 1;
+            }
+        }
+    }
+
+    let mut characters_needed: Vec<Vec<String>> = vec![];
+    for (_, character) in text.char_indices() {
+        let mut character = character.to_uppercase();
+        let mut character = character.next().unwrap();
+        if !characters_ascii.contains_key(&character) {
+            character = '?';
+        }
+        characters_needed.push(characters_ascii.get(&character).unwrap().clone());
+    }
+
+    let mut text_ascii = String::new();
+    for column in 0..height {
+        for row in 0..characters_needed.len() {
+            text_ascii.push_str(&characters_needed[row][column]);
+        }
+        text_ascii.push('\n');
+    }
+    println!("{}", text_ascii);
+}