Password setted by the owner is visibile by everyone.
Everyone watching the contract on Etherscan can see the owner passed myPassword as a parameter when calling
passwordStore.setPassword("myPassword").
Everyone can see onchain the password added by the owner.
Etherscan
Do not store passwords on smart contracts.
Private functions and state variables are only visible for the contract they are defined in and not in derived contracts. In this case private doesn't mean secret/confidential
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