Fixes #5

contracts/SNTPlaceHolder.sol

@@ -3,7 +3,6 @@ pragma solidity ^0.8.18;
 
 import { TokenController } from "@vacp2p/minime/contracts/TokenController.sol";
 import { MiniMeToken } from "@vacp2p/minime/contracts/MiniMeToken.sol";
-import "./SafeMath.sol";
 import "./Owned.sol";
 
 /*
@@ -31,8 +30,6 @@ import "./Owned.sol";
 ///  logic for transferring control of the token to the network when the offering
 ///  asks it to do so.
 contract SNTPlaceHolder is TokenController, Owned {
-    using SafeMath for uint256;
-
     MiniMeToken public snt;
 
     constructor(address _owner, address payable _snt) {

contracts/SafeMath.sol

@@ -1,47 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0
-pragma solidity ^0.8.18;
-
-/**
- * Math operations with safety checks
- */
-library SafeMath {
-    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
-        uint256 c = a * b;
-        assert(a == 0 || c / a == b);
-        return c;
-    }
-
-    function div(uint256 a, uint256 b) internal pure returns (uint256) {
-        // assert(b > 0); // Solidity automatically throws when dividing by 0
-        uint256 c = a / b;
-        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
-        return c;
-    }
-
-    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
-        assert(b <= a);
-        return a - b;
-    }
-
-    function add(uint256 a, uint256 b) internal pure returns (uint256) {
-        uint256 c = a + b;
-        assert(c >= a);
-        return c;
-    }
-
-    function max64(uint64 a, uint64 b) internal pure returns (uint64) {
-        return a >= b ? a : b;
-    }
-
-    function min64(uint64 a, uint64 b) internal pure returns (uint64) {
-        return a < b ? a : b;
-    }
-
-    function max256(uint256 a, uint256 b) internal pure returns (uint256) {
-        return a >= b ? a : b;
-    }
-
-    function min256(uint256 a, uint256 b) internal pure returns (uint256) {
-        return a < b ? a : b;
-    }
-}