ERC20 cleanup.

compiler/tests/fixtures/erc20_token.fe

@@ -2,7 +2,7 @@ contract ERC20:
     _balances: map<address, u256>
     _allowances: map<address, map<address, u256>>
 
-    _totalSupply: u256
+    _total_supply: u256
 
     _name: string100
     _symbol: string100
@@ -18,9 +18,9 @@ contract ERC20:
         idx to: address
         value: u256
 
-    pub def __init__(_name: string100, _symbol: string100):
-        self._name = _name
-        self._symbol = _symbol
+    pub def __init__(name: string100, symbol: string100):
+        self._name = name
+        self._symbol = symbol
         self._decimals = u8(18)
         self._mint(msg.sender, 2600)
 
@@ -34,7 +34,7 @@ contract ERC20:
         return self._decimals
 
     pub def totalSupply() -> u256:
-        return self._totalSupply
+        return self._total_supply
 
     pub def balanceOf(account: address) -> u256:
         return self._balances[account]
@@ -69,7 +69,7 @@ contract ERC20:
         assert sender != address(0)
         assert recipient != address(0)
 
-        self._beforeTokenTransfer(sender, recipient, amount)
+        self._before_token_transfer(sender, recipient, amount)
 
         self._balances[sender] = self._balances[sender] - amount
         self._balances[recipient] = self._balances[recipient] + amount
@@ -78,19 +78,19 @@ contract ERC20:
     def _mint(account: address, amount: u256):
         assert account != address(0)
 
-        self._beforeTokenTransfer(address(0), account, amount)
+        self._before_token_transfer(address(0), account, amount)
 
-        self._totalSupply = self._totalSupply + amount
+        self._total_supply = self._total_supply + amount
         self._balances[account] = self._balances[account] + amount
         emit Transfer(address(0), account, amount)
 
     def _burn(account: address, amount: u256):
         assert account != address(0)
 
-        self._beforeTokenTransfer(account, address(0), amount)
+        self._before_token_transfer(account, address(0), amount)
 
         self._balances[account] = self._balances[account] - amount
-        self._totalSupply = self._totalSupply - amount
+        self._total_supply = self._total_supply - amount
         emit Transfer(account, address(0), amount)
 
     def _approve(owner: address, spender: address, amount: u256):
@@ -100,8 +100,8 @@ contract ERC20:
         self._allowances[owner][spender] = amount
         emit Approval(owner, spender, amount)
 
-    def _setupDecimals(decimals_: u8):
+    def _setup_decimals(decimals_: u8):
         self._decimals = decimals_
 
-    def _beforeTokenTransfer(from: address, to: address, amount: u256):
+    def _before_token_transfer(from: address, to: address, amount: u256):
         pass