OpenZeppelin
Fleeting- External reference: https://docs.openzeppelin.com/contracts/2.x/api/token/erc20#ERC20
Implement ethereum.
ERC20
This implementation is agnostic to the way tokens are created. This means that a supply mechanism has to be added in a derived contract using _mint. For a generic mechanism see ERC20Mintable
— https://docs.openzeppelin.com/contracts/2.x/api/token/erc20#ERC20