Compile error - external and public on same function

[tescher]

external and public on same function:

$ npx hardhat compile
Compiling 3 files with 0.8.4
ParserError: Visibility already specified as "external".
--> contracts/DAORoom.sol:27:38:
|
27 | function rent() external payable public onlyWhenVacant {
| ^^^^^^

Error HH600: Compilation failed
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