parameters: (char_map, index)
return_statement: return None
docstring: Returns the nth character of a character->occurrence map
docstring_summary: Returns the nth character of a character->occurrence map
docstring_tokens: Returns the nth character of a character - > occurrence map
function: def nth_char(char_map, index):
      """Returns the nth character of a character->occurrence map"""
      for char in char_map:
          if index < char_map[char]:
              return char
          index = index - char_map[char]
      return None
function_tokens: def nth_char ( char_map , index ) : for char in char_map : if index < char_map [ char ] : return char index = index - char_map [ char ] return None