List expenses by category
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    Write the command /list_expenses_by_categoryto list the expenses by category.
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    The first view is the main menu with the macro categories. 
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    By selecting one of the options you will view all the expenses labelled within that category and also its total. 
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    With the backbutton you can go back to the main menu and choose another category.
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    If there isn’t any expense in the selected category WeSplitBot will show “No expenses in this category”. 
For more information visit the Wiki.
