Make a code more generic and use object oriented programming

[matjazv]

Description

Make a code more generic by using traits and implementing them on structs or types.

• currently some functions like key_hash(), value_hash(), etc. are used only on &[u8] object type
• we may introduce a trait for those functions and implement it for an object type
• example: instead of a function call key_hash(&value), we could call function value.key_hash() on an object
• reference implementation:

pub trait MyHash {
  fn my_hash(&self) -> Vec<u8>;
}

impl MyHash for &[u8] {
  fn my_hash(&self) -> Vec<u8> {
	let mut hasher = Sha256::new();
	hasher.update(self);
	let result = hasher.finalize();
	return result.as_slice().to_vec();
  }
}

Acceptance Criteria

• traits are used in a code
• methods are implemented for an objects where it makes sense

Additional Information

• only perform this action on a places in the code where and if it makes sense