Function base_to_quote 

pub fn base_to_quote(
    base_amount: u128,
    tick: i16,
    rounding: RoundingDirection,
) -> Option<u128>

Convert base token amount to quote token amount at a given tick.

Formula: quote_amount = (base_amount * price) / PRICE_SCALE

Uses U256 for intermediate multiplication to prevent overflow.

Arguments

• base_amount - Amount of base tokens
• tick - Price tick
• rounding - Rounding direction

Returns

Quote token amount, or None if result exceeds u128