comefrom: <doocs>2109.Adding Spaces to a String_1.py
code: def addSpaces( s: str, spaces: List[int]) -> str:
      ans = []
      j = 0
      for i, c in enumerate(s):
          if j < len(spaces) and i == spaces[j]:
              ans.append(' ')
              j += 1
          ans.append(c)
      return ''.join(ans)
masked: def sample_funcname ( var_0 : str , var_2 : List [ int ] ) -> str :
      var_5 = [ ]
      var_7 = 0
      for var_9 , var_10 in enumerate ( var_0 ) :
          if var_7 < len ( var_2 ) and var_9 == var_2 [ var_7 ] :
              var_5.append ( '' )
              var_7 += 1
          var_5.append ( var_10 )
      return ''.join ( var_5 )
  