From 9927e8f3620833c681c87320889602a8d7dcbba6 Mon Sep 17 00:00:00 2001
From: cephas samuel shehu <stoneluv4live87@gmail.com>
Date: Thu, 15 Aug 2024 19:30:23 +0100
Subject: [PATCH] Assignment ERCtokens

---
 contracts/ERC20.sol  | 4 ++--
 contracts/ERC721.sol | 5 +++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/contracts/ERC20.sol b/contracts/ERC20.sol
index 06e1ed09..542301ca 100644
--- a/contracts/ERC20.sol
+++ b/contracts/ERC20.sol
@@ -62,11 +62,11 @@ contract ERC20 is IERC20 {
         emit Transfer(from, address(0), amount);
     }
 
-    function mint(address to, uint256 amount) external {
+    function mint(address to, uint256 amount) internal {
         _mint(to, amount);
     }
 
-    function burn(address from, uint256 amount) external {
+    function burn(address from, uint256 amount) internal{
         _burn(from, amount);
     }
 }
diff --git a/contracts/ERC721.sol b/contracts/ERC721.sol
index b53814c2..538f839f 100644
--- a/contracts/ERC721.sol
+++ b/contracts/ERC721.sol
@@ -74,8 +74,9 @@ contract ERC721 is IERC721 {
     }
 
     function ownerOf(uint256 id) external view returns (address owner) {
-        owner = _ownerOf[id];
         require(owner != address(0), "token doesn't exist");
+        owner = _ownerOf[id];
+        
     }
 
     function balanceOf(address owner) external view returns (uint256) {
@@ -118,7 +119,7 @@ contract ERC721 is IERC721 {
 
     function transferFrom(address from, address to, uint256 id) public {
         require(from == _ownerOf[id], "from != owner");
-        require(to != address(0), "transfer to zero address");
+
 
         require(_isApprovedOrOwner(from, msg.sender, id), "not authorized");