You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/HandsOnRust/FirstGameFlappyAscii/flappy_dragon/src
    
    the code of the file until where you have to start completion: #![warn(clippy::pedantic)]

use bracket_lib::prelude::*;

const SCREEN_WIDTH : i32 = 80;
const SCREEN_HEIGHT : i32 = 50;
const FRAME_DURATION : f32 = 75.0;

struct Player {
  x: i32,
  y: i32,
  velocity: f32,
}

i
    
  fn render(&mut self, ctx: &mut BTerm, player_x : i32) {
    let screen_x = self.x - player_x;
    let half_size = self.size / 2;

    // Draw the top half of the obstacle
    for y in 0..self.gap_y - half_size {
      ctx.set(
        screen_x,
        y,
        RED,
        BLACK,
        to_cp437('|'),
      );
    }

    // Draw the bottom half of the obstacle
    for y in self.gap_y + half_size..SCREEN_HEIGHT {
      ctx.set(
        screen_x,
        y,
        RED,
        BLACK,
        to_cp437('|'),
      );
    }
  }