Question $6(20$ marks$)$

You have a CSV file named phone$\_$sales$\_2023.$csv containing sales data for four phone brands: Samsung, iPhone, Xiaomi, and Huawei. Each row in the file includes the phone brand, subtype, purchase date, cost, and payment method. The purchase date is formatted as DD$/$MM$/$YYYY$.$

Generate a $2$x$2$ grid of bar charts. Each chart represents a different phone brand and shows the sales for each subtype per month in $2023.$ Use different colours to distinguish between subtypes, position the legend outside the plot to avoid overlapping the bars and remove grid lines.