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$4\mathrm{.}6\mathrm{.}1$: Password requirements.

$579704\mathrm{.}4465750\mathrm{.}9329y7$

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$1$

A website requires that passwords do not contain spaces. For each character in passwordStr that is a space, assign the character with a hashtag $(\text{'}$#$\text{'}).$

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Ex: If the input is $0,x,$ then the output is:

Valid password: $0$#X$

Note: isspace$()$ returns true if a character is whitespace, and false otherwise. Ex: isspace$(\text{'}\text{'})$ returns true. isspace$(\text{'}$a$\text{'})$ returns false$\mathrm{.}23$