First draft of subnet generation function. Still not complete, does overflow but I believe it is only small logic changes

src/main.rs

@@ -8,7 +8,7 @@ mod networking;
 #[allow(unused_variables, unused_mut, unused_assignments)]
 fn main() {
 
-    let networks = Network::create_subnet(&networking::ip::IpAddr::V4(127, 0, 0, 1), 23);
+    let networks = Network::create_subnet(&networking::ip::IpAddr::V4(192, 222, 222, 222), 25);
     if networks.is_err() {
         println!("Hello!");
     }

src/networking/mod.rs

@@ -1,4 +1,4 @@
-use std::str::FromStr;
+use std::{str::FromStr, vec};
 use ip::IpAddr;
 
 pub mod ip;
@@ -51,7 +51,7 @@ impl Network {
     /// ```
     /// let networks = Network::create_subnet(&IpAddr::V4(127, 0, 0, 1), 32);
     /// ```
-    pub fn create_subnet(network_address: &IpAddr, cidr: u8) -> Result<Vec<Network>, NetworkingErr> {
+    pub fn create_subnet(network_address: &IpAddr, cidr: u8) -> Result<Vec<IpAddr>, NetworkingErr> {
         //Get number of host and network bits.
         let network_class = Network::get_network_class(network_address)?;
         let network_address = network_address.to_arr()?;
@@ -64,11 +64,36 @@ impl Network {
         
         let num_borrowed_bits = cidr - network_class as u8;
 
+        //If no subnetting is required, just return the base address
+        if num_borrowed_bits == 0 {
+            unimplemented!();
+        }
+
         // Determine the starting network
-        // Determine the networking gaps
+        let mut base_network = network_address.clone();
+        let most_sig_octet: u8 = match network_class {
+            NetworkClass::A => 1,
+            NetworkClass::B => 2,
+            NetworkClass::C => 3
+        };
+
+        for i in most_sig_octet..4 {
+            base_network[i as usize] = 0;
+        }
+
         // Determine how many networks available
+        // We know that this value is >0 at this point
+        let num_networks = u8::pow(2, num_borrowed_bits as u32);
+
+        // Determine the networking gaps
+        let network_spacing: u8 = u8::pow(2, 8 - num_borrowed_bits as u32);
         
-        let networks = vec![];
+        //Create the subnets
+        let mut networks = vec![];
+        for i in 0..num_networks {
+            networks.push(IpAddr::from_arr(&base_network.clone())?);
+            base_network[most_sig_octet as usize] += network_spacing;
+        }
         Ok(networks)
     }