pub fn word_pattern(pattern: String, string: String) -> bool {
  let mut key_map = std::collections::HashMap::new();
  let mut value_map = std::collections::HashMap::new();

  let mut pattern_iter = pattern.chars();
  let mut string_iter = string.split_whitespace();

  if pattern.len() != string_iter.clone().count() {
    return false;
  }

  for (key, value) in pattern_iter.by_ref().zip(string_iter.by_ref()) {
    let expected_value = *key_map.entry(key).or_insert(value);
    let expected_key = *value_map.entry(value).or_insert(key);

    if expected_key != key || expected_value != value {
      return false;
    }
  }

  pattern_iter.next().is_none() && string_iter.next().is_none()
}