chore: resolve and suppress new warnings

Author: vil02

Cargo.toml

@@ -166,6 +166,7 @@ unwrap_used = { level = "allow", priority = 1 }
 use_debug = { level = "allow", priority = 1 }
 used_underscore_items = { level = "allow", priority = 1 }
 wildcard_enum_match_arm = { level = "allow", priority = 1 }
+needless_for_each = { level = "allow", priority = 1 }
 # style-lints:
 doc_lazy_continuation = { level = "allow", priority = 1 }
 doc_overindented_list_items = { level = "allow", priority = 1 }

src/math/prime_check.rs

@@ -1,5 +1,5 @@
 pub fn prime_check(num: usize) -> bool {
-    if (num > 1) & (num < 4) {
+    if (num > 1) && (num < 4) {
         return true;
     } else if (num < 2) || (num.is_multiple_of(2)) {
         return false;