fn main() {
let text = "hello world";
let upper = text.to_uppercase();
let lower = text.to_lowercase();
let len = text.len();
let trimmed = " spaces ".trim();
let replaced = text.replace("world", "Ruchy");
println!("hello world");
println!("{:?}", upper);
println!("{:?}", lower);
println!("{:?}", len);
println!("{:?}", trimmed);
println!("{:?}", replaced);
}