mirror.md

   def mirror(s):
      """
      """
    stack = Stack()
    x = 0
    n = len(s)

    # Check that the index x is valid index before using it. Short circuit evaluation. 
    while x < n and s[x] != 'm':
       stack.push(s[x])
       x = x + 1

   # skip over 'm'
   x = x + 1 

while x < n and not stack.is_empty() and s[x] == stack.pop():
   x = x + 1 

   is_mirror = ( x == n and stack.empty() )

   return is_mirror