def abs_to_relative_two(s):
stack = Stack()
index = 0
len_f = len(s)
while index < len_f:
while index< len_f and s[index] != '.':
stack.push(s[index])
index += 1
point_count = 0
while index<len_f and s[index] == '.':
index += 1
point_count += 1
if point_count == 2:
stack.pop()
while not stack.isEmpty() and stack.peer() != '/':
stack.pop()
index += 1
return ''.join(stack.items) # print relative path
