fn append_or_replace_price(price: (u64, Permill)) {
			Prices::<T>::mutate(|prices| {
				if prices.len() == NUM_VEC_LEN {
					let _ = prices.pop_front();
				}
				prices.push_back(price);
				log::info!("Prices vector: {:?}", prices);
			});
		}
/// append or replace Storage Prices.
append or replace Storage Prices.
append or replace Storage Prices .
fn append_or_replace_price(price: (u64, Permill)) {
			Prices::<T>::mutate(|prices| {
				if prices.len() == NUM_VEC_LEN {
					let _ = prices.pop_front();
				}
				prices.push_back(price);
				log::info!("Prices vector: {:?}", prices);
			});
		}
fn append_or_replace_price ( price : ( u64 , Permill ) ) { Prices :: < T > :: mutate ( | prices | { if prices . len ( ) == NUM_VEC_LEN { let _ = prices . pop_front ( ) ; } prices . push_back ( price ) ; log :: info ! ( " " prices ) ; } ) ; }
append or replace Storage Prices.
append or replace Storage Prices .
price
(u64, Permill)
price
(u64, Permill)