, which means they are
implemented in C and compiled into the main <code>git</code> executable. Implementing the
very simple <code>psuh</code> command as a built-in will demonstrate the structure of the
codebase, the internal API, and the process of working together as a contributor
with the reviewers and maintainer to integrate this change into the system.</p>
</div>
<div class="paragraph">
<p>Built-in subcommands are typically implemented in a function named "cmd_"
followed by the name of the subcommand, 