comefrom: <garvit244>05_2.py
code: def expand(s, left, right):
      while left >= 0 and right < len(s) and s[left] == s[right]:
          left -= 1
          right += 1
      return right-left-1
masked: def sample_funcname ( var_0 , var_1 , var_2 ) :
      while var_1 >= 0 and var_2 < len ( var_0 ) and var_0 [ var_1 ] == var_0 [ var_2 ] :
          var_1 -= 1
          var_2 += 1
      return var_2 - var_1 - 1
  