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BRIAN YU: Let's dive
into helpers.c, where

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you'll be writing all of your code.

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In this problem, we're asking you to
implement three different functions

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in helpers.c--

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is_rest, duration, and frequency.

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Let's take a look at is_rest first.

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The goal of is_rest is
going to be a function

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that we can see from its signature
takes in a string, which we'll call s,

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and returns a Boolean.

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And effectively all is_rest needs to
do is if s represents a rest, returns

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true.

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Otherwise it's going to return false.

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So if you think back to how we
represented rests using our notation

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and what notes looked
like on a given line

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and what rests looked
like in a given line,

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you'll be able to figure out what
it means for a particular line

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to represent a rest.

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If you're unsure, just think back to
what our representation looks like

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and how notes and rests are represented,
and rest assured, you'll figure it out.

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