with open('includes/sidebar.php', 'r', encoding='utf-8') as f:
    content = f.read()

content = content.replace("href=\"approved_school.php', 'center_profile.php?id=", "href=\"approved_school.php?id=")

with open('includes/sidebar.php', 'w', encoding='utf-8') as f:
    f.write(content)