Could you help me with student codes parts 2 and 3? This is a .nasm file bits 64 global first_func, second_func, third_f

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Could you help me with student codes parts 2 and 3?
This is a .nasm file
bits 64
global first_func, second_func, third_func
extern printf
mystr db "Success!", 0xa, 0x00
first_func:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; The function printf has been
; externed in (above). Call it,
; passing mystr (also defined
; above), as its only argument.
;
; BEGIN student code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; END student code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
ret
extern strlen
second_func:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Your function will be called
; with two arguments: a function
; pointer (the first parameter),
; and a string (the second). The
; function pointer takes two
; arguments: a string, and a length.
; You will need to call strlen
; (above), passing in the string,
; and pass the results to the
; function pointer (along with the
; string). Return the string you get
; back from the function.
;
; BEGIN student code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; END student code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
ret
third_func:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Calculate the Nth fibonacci
; number (where N is the value
; passed to your method as the
; only parameter).
;
; BEGIN student code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; END student code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
ret