Calculate a Basket Total from Delimited Product Records

Implement `total_price_cents(items)` for a list of product records. Each record has exactly this format: ```text sku|product name|quantity|unit price in cents ``` Return the sum of `quantity * unit price in cents` across all records, as an exact integer number of cents represented by a decimal string as described below. For this interface, quantities are whole nonnegative units and prices are nonnegative integer cents. Records are well formed, and fields do not contain the separator character. Each record contributes independently, including records with the same SKU. An empty list has total zero. No discounts, taxes, or rounding are part of this function. ### Exact result representation The input records remain strings in the format above. Return the exact total as a canonical nonnegative decimal string: `"0"` or a sequence of ASCII digits beginning with `1` through `9`, with no sign, leading zeroes, or whitespace. This output representation preserves integer-cent totals of any magnitude. It does not impose a monetary bound or change the arithmetic. Do not round, overflow a fixed-width type, or return a remainder modulo another number. An empty list returns `"0"`. ### Examples ```text total_price_cents(["a100|Apple|2|125", "b200|Bread|1|350"]) -> "600" ``` The records contribute 250 cents and 350 cents. ```text total_price_cents(["a100|Apple|1|125", "a100|Apple|3|125", "c300|Cup|0|400"]) -> "500" ``` Both apple records contribute, and a zero-quantity record contributes zero. Use integer arithmetic to preserve the input's cent-based representation. No maximum list size or monetary bound is specified.