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Assignment ERCtokens #37

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Assignment ERCtokens #37

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4 changes: 2 additions & 2 deletions contracts/ERC20.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -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);
}
}
5 changes: 3 additions & 2 deletions contracts/ERC721.sol
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Expand Up @@ -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) {
Expand Down Expand Up @@ -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");

Expand Down