Function has_whitespace 

pub fn has_whitespace(vec: &Vec<String>) -> bool

Check if a vector contains whitespace

Example:

    use r_unit::vec;

    let mut vec: Vec<String> = Vec::new();
    let string = String::from("H i");

    vec.push(string);

    if vec::has_whitespace(&vec) {
        println!("Contains whitespace.");
    } else {
        println!("Does not contain whitespace.");
    };