From 82e4555bc13de4ceee656c293bd80c1176df0812 Mon Sep 17 00:00:00 2001
From: Ayoub Ammar <162456634+kinoz01@users.noreply.github.com>
Date: Sun, 10 Aug 2025 18:16:05 +0200
Subject: [PATCH] Update lib.rs

simpler prevprime solution, with rust syntax
---
 solutions/previousprime/src/lib.rs | 35 ++++--------------------------
 1 file changed, 4 insertions(+), 31 deletions(-)

diff --git a/solutions/previousprime/src/lib.rs b/solutions/previousprime/src/lib.rs
index 0ced7e5f..629a3575 100644
--- a/solutions/previousprime/src/lib.rs
+++ b/solutions/previousprime/src/lib.rs
@@ -1,33 +1,6 @@
 pub fn prev_prime(nbr: u64) -> u64 {
-    if nbr <= 2 {
-        return 0;
-    }
-
-    let mut min_number = 2;
-
-    for i in 2..nbr {
-        if is_prime(i) {
-            min_number = i;
-        }
-    }
-
-    min_number
-}
-
-fn is_prime(nbr: u64) -> bool {
-    if nbr > 0 {
-        if nbr <= 1 {
-            return false;
-        }
-        let mut d = 2;
-        while d * d <= nbr {
-            if nbr % d == 0 {
-                return false;
-            }
-            d += 1;
-        }
-        return true;
-    } else {
-        return false;
-    }
+    (2..nbr)
+        .rev()
+        .find(|&n| (2..).take_while(|d| d * d <= n).all(|d| n % d != 0))
+        .unwrap_or(0)
 }