let mut vec = vec![10];
vec.push(100);
assert_eq!(vec[1], 100);
fn main() {
let presents = [
"A song and a Christmas tree",
"Two candy canes",
"Three boughs of holly",
];
let mut current_presents = Vec::new();
for (day, present) in presents.iter().enumerate() {
current_presents.push(present);
println!(
"On the {} day of Christmas my good friends brought to me",
day
);
println!("{current_presents:?}
");
}
}