Register Function with Save Option

function Init()
io.write("Welcome to Register Form!\n")
Register()
end

function Register()
local firstname,lastname = '',''
io.write('Your First Name: ')
firstname = io.read()
io.write('Your Last Name: ')
lastname = io.read()
io.write('Your Email: ')
email = io.read()
io.write('Your Phone: ')
phone = io.read()
file = io.open('register.txt', 'a')
file:write('\n','Full Name: ',firstname,' ',lastname,'\n','E-Mail: ',email,'\n','Phone: ',phone,'\n')
end

Init()