shelf stocker algorithm lv3 :
exp check
remove merch
sort removed merch in temp area
if quantity > shelf space : set fill mode to stuffed, set overflow replicated amount to storage
fill in new merch, then old sorted merch
dilute : try to place merch of not full columns into merch replicated not full columns, this goes for items of very low quantity
kinds not displayed ? remove sample colomn of replicated merch
and replace with undisplayed merch
left over room ? if yes move chunk of merch on shelf to make room