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## capitalizing
### Instructions
Complete the `capitalize_first` **function** which converts the first letter of the string to uppercase.
Complete the `title_case` **function** which converts the first letter of each word in a string to uppercase.
Complete the `change_case` **function** which converts the uppercase letters of a string into lowercase, and the lowercase to uppercase.
### Expected Functions
```rust
pub fn capitalize_first(input: &str) -> String {
}
pub fn title_case(input: &str) -> String {
}
pub fn change_case(input: &str) -> String {
}
```
### Usage
4 years ago
Here is a program to test your functions.
```rust
use capitalizing::*;
fn main() {
println!("{}", capitalize_first("joe is missing"));
println!("{}", title_case("jill is leaving A"));
println!("{}",change_case("heLLo THere"));
}
```
And its output
4 years ago
```consoole
$ cargo run
Joe is missing
Jill Is Leaving A
HEllO thERE
$
```