Merge pull request #1232 from LeandroPG19/perf/presize-mac-string

perf: pre-size mac_from_dec_to_hex String with capacity

src/networking/manage_packets.rs

@@ -492,7 +492,7 @@ pub fn is_my_address(local_address: &IpAddr, my_interface_addresses: &Vec<Addres
 
 /// Converts a MAC address in its hexadecimal form
 fn mac_from_dec_to_hex(mac_dec: [u8; 6]) -> String {
-    let mut mac_hex = String::new();
+    let mut mac_hex = String::with_capacity(17);
     for n in &mac_dec {
         let _ = write!(mac_hex, "{n:02x}:");
     }