solution to exercise 02_03
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/// Return `true` if `n` is even, `false` otherwise.
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/// Return `true` if `n` is even, `false` otherwise.
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fn is_even(n: u32) -> bool {
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fn is_even(n: u32) -> bool {
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todo!()
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n % 2 == 0
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}
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}
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#[cfg(test)]
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#[cfg(test)]
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