CODING_18498_CHANGE_PASSWORD

 - [ ] Controller 
    - [ ] create function put_change_password 
 - [ ] Model
    - [ ] create validate_password
    - [ ] create change_password function
@lam-vy-mulodo: Just for next tasks. Try to prevent from confused constant name. For example, use "TOKEN_NULL_MSG" instead of "TOKEN_NULL_MESS". I imaged MESSY soccer player when I first saw MESS. :D