make left-padded (#89)

Author: axchu

contracts/optimistic-ethereum/libraries/utils/Lib_Bytes32Utils.sol

@@ -55,6 +55,6 @@ library Lib_Bytes32Utils {
             bytes32 _out
         )
     {
-        return bytes32(bytes20(_in));
+        return bytes32(uint256(_in));
     }
 }

test/data/json/libraries/utils/Lib_Bytes32Utils.test.json

@@ -41,7 +41,7 @@
         "fromAddress": {
             "input address": {
                 "in": ["0x1212121212121212121212121212121212121212"],
-                "out": ["0x1212121212121212121212121212121212121212000000000000000000000000"]
+                "out": ["0x0000000000000000000000001212121212121212121212121212121212121212"]
             }
         }
     }