Fixed food spawning and snake collision

Fixed the food spawning in the walls
Fixed the snake not colliding with itself
Added speed control to the snake
Exit if the ncurses window is too small

src/main.rs

@@ -4,7 +4,9 @@ mod highscore;
 mod menu;
 // use game::{Cell, Snake};
 // use ncurses::*;
-use ncurses::{curs_set, endwin, initscr, keypad, noecho, raw, refresh, stdscr, CURSOR_VISIBILITY};
+use ncurses::{
+    curs_set, endwin, getmaxyx, initscr, keypad, noecho, raw, refresh, stdscr, CURSOR_VISIBILITY,
+};
 
 fn main() {
     // let (lines, cols): (i32, i32) = (0, 0);
@@ -13,6 +15,14 @@ fn main() {
     keypad(stdscr(), true);
     curs_set(CURSOR_VISIBILITY::CURSOR_INVISIBLE);
     noecho();
+    let (mut mlines, mut mcols): (i32, i32) = (0, 0);
+    getmaxyx(stdscr(), &mut mlines, &mut mcols);
+    if (mlines < 20) || (mcols < 35) {
+        refresh();
+        endwin();
+        eprintln!("Sorry window size too small");
+        std::process::exit(1);
+    }
     loop {
         match menu::main_menu_control() {
             0 => game::start(),