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snowhite lib modules stock_market adapter.ex
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lib/modules/stock_market/adapter.ex

defmodule Snowhite.Modules.StockMarket.Adapter do
alias Snowhite.Modules.StockMarket.Symbol
@callback fetch_symbol(String.t(), Keyword.t()) :: Symbol.t() | nil
def invoke(adapter, symbol, options) do
apply(adapter, :fetch_symbol, [symbol, options])
end
end