Standardize TODO Comment Formatting

[arkaprovob]

Description:
Our codebase contains inconsistent TODO comment formatting. Some are "// TODO:" (uppercase), while others are "// todo" (lowercase). To ensure consistency, let's standardize the format to "// TODO:" (uppercase) throughout the code.

Benefits:

• Improved code readability.
• Consistency in TODO comments.
• Easier tracking of tasks.

Implementation:

1. Search and update existing TODO comments.
2. Encourage using "// TODO:" (uppercase) for new comments.