Salvation ERC20 Sourcecode

Salvation.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol';
import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/extensions/ERC20Burnable.sol';

contract Salvation is ERC20, ERC20Burnable {
    
    constructor() ERC20('Salvation', 'SLN') {
        _mint(msg.sender, cap() * 10 ** 2);
    }
    
    /** SLN is capped at 400Bn SLN */
    uint256 private immutable _cap = 40 * 10 ** 10;
    
    /** SLN only uses 2 decimals after the comma */
    function decimals() public view virtual override returns (uint8) {
        return 2;
    }
    
    /** 
    * Get current coin burn amount 
    */
    function burnAmount() public view virtual returns (uint256) { 
        uint256 currentSupply = ERC20.totalSupply();
        
        // Based on current supply, burn rate is either lower or higher
        if (currentSupply < 1000) {
            return 1;
        }
        else if (currentSupply < 40 * 10 ** 4) {
            return 1000;
        } 
        else if (currentSupply < 40 * 10 ** 6) {
            return 10000;
        }
        else {
            return 100000;
        }
    }

    /**
     * @dev Returns the cap on the token's total supply.
     */
    function cap() public view virtual returns (uint256) {
        return _cap;
    }
    
    /**
     * Override to take into account burnt coin during transfers
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        uint256 currentBurnAmount = burnAmount();
        if (amount <= currentBurnAmount) {
            return false;
        } 
        amount -= currentBurnAmount;
        burn(currentBurnAmount);
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
}