Function rfind_and_count

pub fn rfind_and_count(source: &str, char: char) -> usize

Count number of characters since the last occurrence of char.

Finds last occurrence of char in source, returns number of characters from that last occurrence. If char is not found, return number of characters total.

assert_eq!(rfind_and_count("abcde", 'e'), 0);
assert_eq!(rfind_and_count("abcde", 'b'), 3);
assert_eq!(rfind_and_count("abcde", 'z'), 5);