# reverse string
def reverse_string(s)
  temp = ''
  string_length = s.length

  0.upto(string_length/2).each do |n|
    temp = s[n]
    s[n] = s[string_length-n-1]
    s[string_length-n-1] = temp
  end
  s
end

s = "Heres a string to reverse yo"
puts s.object_id
r = reverse_string(s)
puts r
puts r.object_id