Thunderbolt 3 (40 GBPs) Extension Cable

Looking for a Thunderbolt 3 Extension cable or female to female adapter.

note that I mean Thunderbolt 3, not simply USB-C.

Thunderbolt 3 MALE ============<this is a cable or adapter>============ Thunderbolt 3 FEMALE

OR

Thunderbolt 3 FEMALE ============<this is a cable or adapter>============ Thunderbolt 3 FEMALE

Thanks.