I have issues in my python code, keeps telling me indentation error , below are my app.py, model.py and init.py

from flask import Flask, render_template, redirect, url_for

from flask_login import login_user, logout_user, login_required, current_user

from app import create_app, db



app = create_app()



@app.route('/register', methods=['GET', 'POST'])

def register():

    if current_user.is_authenticated:

        return redirect(url_for('home.html'))

    form = RegistrationForm()

    if form.validate_on_submit():

        user = User(username=form.username.data, password_hash=form.password.data)

        db.session.add(user)

        db.session.commit()

        return redirect(url_for('login.html'))

    return render_template('register.html', form=form)



@app.route('/login', methods=['GET', 'POST'])

def login():

    if current_user.is_authenticated:

        return redirect(url_for('home.html'))

    form = LoginForm()

    if form.validate_on_submit():

        user = User.query.filter_by(username=form.username.data).first()

        if user and check_password_hash(user.password_hash, form.password.data):

            login_user(user)

            return redirect(url_for('home.html'))

    return render_template('login.html', form=form)



@app.route('/')

@app.route('/home')

@login_required

def home():

    return render_template('home.html')





from flask import Flask

from flask_sqlalchemy import SQLAlchemy





db = SQLAlchemy()



def create_app():

        app = Flask(__name__)

        app.config['SECRET_KEY'] = 'your_secret_key'

        app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///db.sqlite'

        

        db.init_app(app)

        

        from flask_login import LoginManager  # Move the import here

        

        login_manager = LoginManager()

        login_manager.init_app(app)



        from app.models import User



        @login_manager.user_loader

        def load_user(user_id):

            return User.query.get(int(user_id))

            

        return app




from flask_sqlalchemy import SQLAlchemy

from werkzeug.security import generate_password_hash, check_password_hash

from flask_login import UserMixin



db = SQLAlchemy()



class User(UserMixin, db.Model):

    id = db.Column(db.Integer, primary_key=True)

    username = db.Column(db.String(64), unique=True, nullable=False)

    password_hash = db.Column(db.String(128))