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fn trim_me(input: &str) -> &str {
input.trim()
}
fn compose_me(input: &str) -> String {
// The macro `format!` has the same syntax as `println!`, but it returns a
// string instead of printing it to the terminal.
// Equivalent to `input.to_string() + " world!"`
format!("{input} world!")
}
fn replace_me(input: &str) -> String {
input.replace("cars", "balloons")
}
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn trim_a_string() {
assert_eq!(trim_me("Hello! "), "Hello!");
assert_eq!(trim_me(" What's up!"), "What's up!");
assert_eq!(trim_me(" Hola! "), "Hola!");
assert_eq!(trim_me("Hi!"), "Hi!");
}
#[test]
fn compose_a_string() {
assert_eq!(compose_me("Hello"), "Hello world!");
assert_eq!(compose_me("Goodbye"), "Goodbye world!");
}
#[test]
fn replace_a_string() {
assert_eq!(
replace_me("I think cars are cool"),
"I think balloons are cool",
);
assert_eq!(
replace_me("I love to look at cars"),
"I love to look at balloons",
);
}
}
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