rework erc20

start to standardize syntax 4 spaces/tab add implementation reference links improve tests
ksami007 · Oct 22, 2019 · 1175598 · 1175598
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diff --git a/README.md b/README.md
@@ -1,11 +1,10 @@
 # Uniswap v2 Smart Contracts
-
 [![CircleCI](https://circleci.com/gh/Uniswap/uniswap-v2.svg?style=svg)](https://circleci.com/gh/Uniswap/uniswap-v2)
 
+
 ## Local Development
 
 ### Clone Repository
-
 ```
 git clone https://github.com/Uniswap/uniswap-v2.git
 cd uniswap-v2
@@ -21,3 +20,27 @@ yarn
 yarn compile
 yarn test
 ```
+
+
+## Implementation References
+
+### [`contracts/libraries/SafeMath.sol`](./contracts/libraries/SafeMath.sol)
+
+#### OpenZeppelin
+[https://github.com/OpenZeppelin/openzeppelin-contracts/blob/2f9ae975c8bdc5c7f7fa26204896f6c717f07164/contracts/math/SafeMath.sol](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/2f9ae975c8bdc5c7f7fa26204896f6c717f07164/contracts/math/SafeMath.sol)
+
+### [`contracts/libraries/Math.sol`](./contracts/libraries/Math.sol)
+
+#### OpenZeppelin
+[https://github.com/OpenZeppelin/openzeppelin-contracts/blob/2f9ae975c8bdc5c7f7fa26204896f6c717f07164/contracts/math/Math.sol#L17](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/2f9ae975c8bdc5c7f7fa26204896f6c717f07164/contracts/math/Math.sol#L17)
+
+#### dapp-bin
+[https://github.com/ethereum/dapp-bin/blob/11f05fc9e3f31a00d57982bc2f65ef2654f1b569/library/math.sol#L28](https://github.com/ethereum/dapp-bin/blob/11f05fc9e3f31a00d57982bc2f65ef2654f1b569/library/math.sol#L28) via [https://github.com/ethereum/dapp-bin/pull/50](https://github.com/ethereum/dapp-bin/pull/50)
+
+### [`contracts/implementations/ERC20.sol`](./contracts/implementations/ERC20.sol)
+
+#### OpenZeppelin
+[https://github.com/OpenZeppelin/openzeppelin-contracts/blob/2f9ae975c8bdc5c7f7fa26204896f6c717f07164/contracts/token/ERC20](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/2f9ae975c8bdc5c7f7fa26204896f6c717f07164/contracts/token/ERC20)
+
+#### Dai
+[https://github.com/makerdao/dss/blob/b1fdcfc9b2ab7961bf2ce7ab4008bfcec1c73a88/src/dai.sol](https://github.com/makerdao/dss/blob/b1fdcfc9b2ab7961bf2ce7ab4008bfcec1c73a88/src/dai.sol)
diff --git a/contracts/ERC20.sol b/contracts/ERC20.sol
diff --git a/contracts/Math.sol b/contracts/Math.sol