started working o nstuff yay

lib/Class1.cs

@@ -1,6 +0,0 @@
-namespace lib;
-
-public class Class1
-{
-
-}

lib/Request.cs

@@ -0,0 +1,10 @@
+namespace lib;
+
+public enum RequestType {
+    Register = 1,
+    ConfirmRegister = 2,
+    GetMessages = 3,
+    GetUserKey = 4,
+    SendMessage = 5,
+    SendAck = 6
+}

lib/Utils.cs

@@ -0,0 +1,53 @@
+using System.Text;
+using System.Linq;
+
+namespace lib;
+
+public static class Utils {
+    public static byte[] NumberToBytes(string Number) {
+        if(Number.Any(c => !char.IsDigit(c)) || Number.Length > 16) {
+            throw new Exception("Invalid arguments!");
+        }
+        byte[] res = Enumerable.Repeat((byte)0b1111_1111, 8).ToArray();
+        // Pad Number if needed to be of even length (because each 2 digits are turned into 1 byte)
+        Number = Number.Length % 2 == 0 ? Number : Number + '-';
+
+        for(int i = 0; i < Number.Length - 1; i += 2) {
+            char c1 = Number[i];
+            char c2 = Number[i + 1];
+            res[i / 2] = (byte)((DigitToByte(c1) << 4) | DigitToByte(c2));
+        }
+        return res;
+    }
+
+    public static string BytesToNumber(byte[] Bytes) {
+        string s = "";
+        foreach(byte b in Bytes) {
+            byte b1 = (byte)((b >> 4) & 0b1111);
+            byte b2 = (byte)(b & 0b1111);
+            s = s + ByteToDigit(b1) + ByteToDigit(b2);
+        }
+        return new string(s.Where(c => char.IsDigit(c)).ToArray());
+    }
+
+
+    public static byte DigitToByte(char c) {
+        if (int.TryParse(c.ToString(), out int d)) {
+            return (byte)d;
+        }
+        else {
+            return 0b1111; // empty, turned into '-' later to be discarded
+        }
+    }
+
+    public static char ByteToDigit(byte b) {
+        byte offset = Encoding.ASCII.GetBytes("0")[0];
+
+        if(b == 0b1111) {
+            return '-';
+        }
+        else {
+            return Encoding.ASCII.GetChars([(byte)(b + offset)])[0];
+        }
+    }
+}