fix: make precedence of operators within expressions explicit

[metal-oopa]

Associated Issue

Closes #75

Implemented Solution

Added brackets to make the precedence of operators explicit.

if (username_len < MIN_USERNAME_LENGTH || username_len > MAX_USERNAME_LENGTH) to if ((username_len < MIN_USERNAME_LENGTH) || (username_len > MAX_USERNAME_LENGTH))

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[jmakhack]

@all-contributors please add @metal-oopa for code

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@jmakhack

I've put up a pull request to add @metal-oopa! :tada:

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