Return existing string instance for String.Join when there is only one item in the list
Return existing string instance for String.Join when there is only one item in the list

shrah/corert,botaberg/corert,tijoytom/corert,mjp41/corert,sandreenko/corert,sandreenko/corert,botaberg/corert,sandreenko/corert,krytarowski/corert,krytarowski/corert,krytarowski/corert,gregkalapos/corert,shrah/corert,tijoytom/corert,schellap/corert,kyulee1/corert,yizhang82/corert,tijoytom/corert,yizhang82/corert,gregkalapos/corert,manu-silicon/corert,tijoytom/corert,gregkalapos/corert,schellap/corert,manu-silicon/corert,schellap/corert,kyulee1/corert,kyulee1/corert,yizhang82/corert,gregkalapos/corert,schellap/corert,botaberg/corert,manu-silicon/corert,shrah/corert,mjp41/corert,botaberg/corert,shrah/corert,sandreenko/corert,mjp41/corert,yizhang82/corert,manu-silicon/corert,mjp41/corert,mjp41/corert,schellap/corert,manu-silicon/corert,kyulee1/corert,krytarowski/corert