refactor: order functions by visibility (public, internal, private)

[CaptainLEVI-XXX]

Refactor Function Ordering by Visibility Modifiers

Description

This PR addresses one of the goals outlined in issue #653

• Reorganization of functions according to visibility modifiers (Move internal functions up, private functions down)

Changes Made

• Refactored function ordering in contracts to follow a consistent pattern:
  • Public->internal->private
• Maintained functionality without changing any function signatures or behavior

Testing

• All existing tests continue to pass
• No functional changes were made, only code organization improvements

[CaptainLEVI-XXX]

Hey @zerosnacks, I've addressed one of the goals mentioned in issue 653. Would you mind reviewing this PR when you have a chance? Thank you!