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Outline

• interface ICloneFactory
•    - function clone(address prototype)
•  contract CloneFactory is ICloneFac ... *
•    - function clone(address prototype)

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/**
 *Submitted for verification at Etherscan.io on 2020-08-07
*/

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

interface ICloneFactory {
    function clone(address prototype) external returns (address proxy);
}

// introduction of proxy mode design: https://docs.openzeppelin.com/upgrades/2.8/
// minimum implementation of transparent proxy: https://eips.ethereum.org/EIPS/eip-1167

contract CloneFactory is ICloneFactory {
    function clone(address prototype) external override returns (address proxy) {
        bytes20 targetBytes = bytes20(prototype);
        assembly {
            let clone := mload(0x40)
            mstore(clone, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
            mstore(add(clone, 0x14), targetBytes)
            mstore(
                add(clone, 0x28),
                0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000
            )
            proxy := create(0, clone, 0x37)
        }
        return proxy;
    }
}

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[{"inputs":[{"internalType":"address","name":"prototype","type":"address"}],"name":"clone","outputs":[{"internalType":"address","name":"proxy","type":"address"}],"stateMutability":"nonpayable","type":"function"}]

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ipfs://592e9bb078414ec822c4dd722a08b333e8a0faf4d9aec37951f73c5b14e89f82