coding_pk 0.13.0

A simple pk for coding solution
Documentation
pub mod leetcode21;
pub mod leetcode19;
pub mod leetcode206;

#[derive(PartialEq, Eq, Clone, Debug)]
pub struct ListNode {
  pub val: i32,
  pub next: Option<Box<ListNode>>
}

impl ListNode {
  #[inline]
  fn new(val: i32) -> Self {
    ListNode {
      next: None,
      val
    }
  }
}