Function leftpad 

pub fn leftpad(input: &str, width: usize, padding_char: char) -> String

Pads the given string on the left with a specified character up to a specified width.

Arguments

• input - The string to be padded.
• width - The desired width of the resulting padded string.
• padding_char - The character used for padding.

Examples

use leftpad::leftpad;

assert_eq!(leftpad("hello", 8, '*'), "***hello");
assert_eq!(leftpad("rust", 6, ' '), "  rust");