Function quote_to_base 

pub fn quote_to_base(
    quote_amount: u128,
    tick: i16,
    rounding: RoundingDirection,
) -> Option<u128>

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

Formula: base_amount = (quote_amount * PRICE_SCALE) / price

Uses U256 for intermediate multiplication to prevent overflow.

Arguments

• quote_amount - Amount of quote tokens
• tick - Price tick
• rounding - Rounding direction

Returns

Base token amount, or None if result exceeds u128