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pub(crate) fn empty_or_none<T>(input: &[T]) -> Option<&[T]> {
if input.is_empty() {
None
} else {
Some(input)
}
}
#[inline]
pub(crate) fn copy_on_push_vec<T>(input: &[T], el: T) -> Vec<T>
where
T: Clone,
{
let mut new_vec = Vec::with_capacity(input.len() + 1);
new_vec.extend_from_slice(input);
new_vec.push(el);
new_vec
}
#[inline]
pub(crate) fn extend(base: &mut Vec<String>, slice: &[String]) {
for i in slice {
base.push(i.to_owned());
}
}
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