Update minesweeper

src/minesweeper.rs

@@ -1,26 +1,22 @@
 pub fn annotate(minefield: &[&str]) -> Vec<String> {
-    if minefield.is_empty() {
-        return Vec::new();
-    }
-
-    let cleaned_strs: Vec<Vec<char>> = minefield
-        .iter()
-        .map(|x| x.chars().collect())
-        .collect();
-
-    let (x_len, y_len) = (cleaned_strs.len(), cleaned_strs[0].len());
-
     let mut result = Vec::new();
 
-    for (x, row) in cleaned_strs.iter().enumerate() {
+    for (x, row) in minefield.iter().enumerate() {
         let mut result_row = String::new();
-        for (y, item) in row.iter().enumerate() {
-            if *item == '*' {
+        for (y, item) in row.chars().enumerate() {
+            if item == '*' {
                 result_row.push('*');
             } else {
-                let count = count_mines(&cleaned_strs, x as isize, y as isize, x_len as isize, y_len as isize);
+                let mut count = 0;
+                for i in x.saturating_sub(1)..=(x + 1) {
+                    for j in y.saturating_sub(1)..=(y + 1) {
+                        if i < minefield.len() && j < row.len() && minefield[i].chars().nth(j) == Some('*') {
+                            count += 1;
+                        }
+                    }
+                }
                 if count > 0 {
-                    result_row.push(char::from_digit(count as u32, 10).unwrap());
+                    result_row.push_str(&count.to_string());
                 } else {
                     result_row.push(' ');
                 }
@@ -31,25 +27,3 @@ pub fn annotate(minefield: &[&str]) -> Vec<String> {
 
     result
 }
-
-fn count_mines(cleaned_strs: &Vec<Vec<char>>, x: isize, y: isize, x_len: isize, y_len: isize) -> u8 {
-    let mut count: u8 = 0;
-
-    for dx in -1..=1 {
-        for dy in -1..=1 {
-            if dx == 0 && dy == 0 {
-                continue;
-            }
-            let new_x = x + dx;
-            let new_y = y + dy;
-
-            if new_x >= 0 && new_x < x_len && new_y >= 0 && new_y < y_len {
-                if cleaned_strs[new_x as usize][new_y as usize] == '*' {
-                    count += 1;
-                }
-            }
-        }
-    }
-
-    count
-}