old_contents: import core
  import algos
  import backtest
  
  from .backtest import Backtest, run
  from .core import Strategy, Algo, AlgoStack
  
  import ffn
  from ffn import finance, utils, data, get, merge
  
new_contents: import core
  import algos
  import backtest
  
  from .backtest import Backtest, run
  from .core import Strategy, Algo, AlgoStack
  
  import ffn
  from ffn import core as finance
  from ffn import utils, data, get, merge
  
subject: refactor after ffn reorg