Move Ed25519 to the encoding package - it's only used by the SolanaPr…

…ogramDerivedAddress so just put it next to it in the package

message-encoding/src/jmh-test/java/com/lmax/solana4j/EddsaPointOnCurveBenchmark.java → message-encoding/src/jmh-test/java/com/lmax/solana4j/encoding/EddsaPointOnCurveBenchmark.java

@@ -1,6 +1,5 @@
-package com.lmax.solana4j;
+package com.lmax.solana4j.encoding;
 
-import com.lmax.solana4j.util.Ed25519;
 import com.lmax.solana4j.util.TestKeyPairGenerator;
 import net.i2p.crypto.eddsa.math.GroupElement;
 import org.openjdk.jmh.annotations.Benchmark;

message-encoding/src/main/java/com/lmax/solana4j/util/Ed25519.java → message-encoding/src/main/java/com/lmax/solana4j/encoding/Ed25519.java

@@ -1,4 +1,4 @@
-package com.lmax.solana4j.util;
+package com.lmax.solana4j.encoding;
 
 import java.math.BigInteger;
 
@@ -14,7 +14,7 @@
  * The Ed25519 curve equation is:
  * dx^2y^2 + x^2 = y^2 - 1 (mod P), where d is a curve constant.
  */
-public final class Ed25519
+final class Ed25519
 {
     private static final BigInteger P = new BigInteger("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed", 16);
     private static final BigInteger D = new BigInteger("52036cee2b6ffe738cc740797779e89800700a4d4141d8ab75eb4dca135978a3", 16);
@@ -31,7 +31,7 @@ private Ed25519()
      * @return true if the point is on the curve, false otherwise.
      * @throws IllegalArgumentException if the public key byte array is not 32 bytes long.
      */
-    public static boolean isOnCurve(final byte[] publicKeyBytes)
+    static boolean isOnCurve(final byte[] publicKeyBytes)
     {
         if (publicKeyBytes.length != 32)
         {

message-encoding/src/main/java/com/lmax/solana4j/encoding/SolanaProgramDerivedAddress.java

@@ -2,7 +2,6 @@
 
 import com.lmax.solana4j.api.ProgramDerivedAddress;
 import com.lmax.solana4j.api.PublicKey;
-import com.lmax.solana4j.util.Ed25519;
 
 import java.nio.ByteBuffer;
 import java.nio.charset.StandardCharsets;

message-encoding/src/test/java/com/lmax/solana4j/util/Ed25519Test.java → message-encoding/src/test/java/com/lmax/solana4j/encoding/Ed25519Test.java

@@ -1,5 +1,6 @@
-package com.lmax.solana4j.util;
+package com.lmax.solana4j.encoding;
 
+import com.lmax.solana4j.util.TestKeyPairGenerator;
 import net.i2p.crypto.eddsa.math.GroupElement;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;