feat: add display function

This commit introduces a new `display` function:
- It takes an immutable reference to a grid of bool values
- It takes mutable reference to a String buffer.

it writes to the buffer, `X` or `.` depending on the grid's bool element.

Cargo.lock

@@ -3,5 +3,5 @@
 version = 4
 
 [[package]]
-name = "GameOfLife_rs"
+name = "GameOfLife"
 version = "0.1.0"

Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "GameOfLife_rs"
+name = "GameOfLife"
 version = "0.1.0"
 edition = "2024"
 

src/main.rs

@@ -1,3 +1,23 @@
-fn main() {
+const WIDTH: usize = 30;
-    println!("Hello, world!");
+const HEIGHT: usize = 30;
+
+fn display(grid: &[[bool; WIDTH]; HEIGHT], buffer: &mut String) {
+    buffer.clear();
+
+    for row in grid {
+        for &cell in row {
+            buffer.push(if cell { 'X' } else { '.' });
+            buffer.push(' ');
+        }
+        buffer.push('\n');
+    }
+
+    println!("{}", buffer);
+}
+
+fn main() {
+    let grid: [[bool; WIDTH]; HEIGHT] = [[false; WIDTH]; HEIGHT];
+    let mut buffer: String = String::new();
+    
+    display(&grid, &mut buffer);
 }