Exclude Swedish VAT (25%) from prices and amounts in HTML output

Multiply price and amount by 0.8 before generating HTML.
Original CSV and TXT files remain unchanged.

src/main.rs

@@ -124,9 +124,9 @@ impl PreparedCustomer {
                     .map(|t| FormattedTransaction {
                         date: t.date.format("%Y-%m-%d %H:%M").to_string(),
                         quality_name: t.quality_name,
-                        price: fmt(t.price),
+                        price: fmt(t.price * 0.8),
                         volume: fmt(t.volume),
-                        amount: fmt(t.amount),
+                        amount: fmt(t.amount * 0.8),
                         receipt: t.receipt,
                     })
                     .collect();
@@ -158,7 +158,7 @@ impl PreparedCustomer {
         for card in &cards {
             for tx in &card.transactions {
                 let volume: f64 = tx.volume.parse().unwrap();
-                let amount: f64 = tx.amount.parse().unwrap();
+                let amount: f64 = tx.amount.parse::<f64>().unwrap();
                 let entry = product_totals
                     .entry(tx.quality_name.clone())
                     .or_insert((0.0, 0.0));