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EIP-1167 Minimal Proxy Contract written in Huff

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# Huff - EIP-1167 Minimal Proxy Contract

[EIP-1167: Minimal Proxy Contract](https://eips.ethereum.org/EIPS/eip-1167) implementation with [Huff](https://huff.sh/).
This repo supports dynamic address embedding and gas-efficient bytecode generation for a vanity address (like `0x000000...`).

## Source

```js
├── src
│   ├── MinimalProxy.huff           // using PUSH1 without the jump label
│   ├── MinimalProxyUsingLabel.huff // using the jump label and PUSH2.
│   └── SimpleStore.huff
└── test
    ├── MinimalProxy.t.sol
    └── SimpleStore.t.sol
```

## Dynamic Address Embedding
Embed the address of the delegate destination as follows:

`MinimalProxy.huff`:
```js
#define constant ADDRESS = 0x0102030405060708091011121314151617181920 // dummy address
#define constant JUMPI_DST = 0x2b
...
```

`MinimalProxyUsingLabel.huff`:
```js
#define constant ADDRESS = 0x0102030405060708091011121314151617181920 // dummy address
...
```

`MinimalProxy.t.sol`:
```solidity
contract MinimalProxyTest is Test {
    SimpleStore simpleStore;
    SimpleStore minimalProxy;
    SimpleStore minimalProxyUsingLabel;
    SimpleStore minimalProxyWithVanityAddress;
    uint256 constant defaultJumpiDst = 0x2b;
    address constant vanityAddress = 0x0000000000060708091011121314151617181920;

function setUp() public {
        simpleStore = SimpleStore(HuffDeployer.deploy("SimpleStore"));

// 45 bytes: minimal proxy contract
        minimalProxy =
            SimpleStore(new HuffConfig().with_addr_constant("ADDRESS", address(simpleStore)).deploy("MinimalProxy"));

// 46 bytes: minimal proxy contract using the jump label
        minimalProxyUsingLabel = SimpleStore(
            new HuffConfig().with_addr_constant("ADDRESS", address(simpleStore)).deploy("MinimalProxyUsingLabel")
        );

// 40 bytes: minimal proxy contract with the vanity address
        vm.etch(vanityAddress, address(simpleStore).code);
        string memory vanityAddressString = Strings.toHexString(uint160(vanityAddress));
        uint256 numberOfLeadingZeroBytes = ((2 + 20 * 2) - bytes(vanityAddressString).length) / 2;
        string memory jumpiDst = Strings.toHexString(defaultJumpiDst - numberOfLeadingZeroBytes, 1);
        minimalProxyWithVanityAddress = SimpleStore(
            new HuffConfig().with_constant("ADDRESS", vanityAddressString).with_constant("JUMPI_DST", jumpiDst).deploy("MinimalProxy")
        );
    }
...
```

## Test
```
forge test -vvvvv
```

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