Calculate_avg_candle_vol.jl

function average_price_df(currency::String, df_in::DataFrame, df_out_price::DataFrame, df_out_candle::DataFrame)
    
    if isempty(names(df_out_price))
        df_out_price[!,:Date] = df_in[!,:Date]
    end    
    
    df_out_price[!,Symbol("$currency")] = (df_in[!,Symbol("open (EUR)")] + df_in[!,Symbol("high (EUR)")] + df_in[!,Symbol("low (EUR)")] + df_in[!,Symbol("close (EUR)")])/4

    candle_col = []
    for i in 1:size(df_in)[1]
        push!(candle_col, (df_in[!,Symbol("open (EUR)")][i], df_in[!,Symbol("high (EUR)")][i], df_in[!,Symbol("low (EUR)")][i], df_in[!,Symbol("close (EUR)")][i]))
    end

    if isempty(names(df_out_candle))
        df_out_candle[!,:Date] = df_in[!,:Date]
    end
    df_out_candle[!,Symbol("$currency")] = candle_col    
end

function vol_df(currency::String, df_in::DataFrame, df_out_vol::DataFrame)
    if isempty(names(df_out_vol))
        df_out_vol[!,:Date] = df_in[!,:Date]
    end 

    df_out_vol[!,Symbol("$currency")] = df_in[!,:volume]
end