### Convert a Vec<String> to Vec<&str>

```rust
let v: Vec<&str> = v.iter().map(AsRef::as_ref).collect();
```
  
### Convert a collection of characters into a String

1. chars.iter().collect::<String>()


```rust
// Vec<char> -> String
let chars = vec!['a', 'b', 'c'];
let string = chars.iter().collect::<String>();

// [char] -> String
let chars = ['a', 'b', 'c'];
let string = chars.iter().collect::<String>();
  
// &[char] -> String
let slice_chars = &chars[..];
let string = slice_chars.iter().collect::<String>();
```
  
2. chars.concat()

```rust
//  Vec<char> -> String  
let chars = vec!["a", "b", "c"];
let string = chars.concat();
```

3. strings.join(separator)

```rust
let names = ["firstName", "lastName"];
let joined = names.join(", ");
```