human
Solve the following python programming problem given the following code:
def __init__(self, string_chunks) : 
    def flatten(chunks) : 
        if (type (chunks) == str) : 
            return chunks 
else : 
            chunk_strings = [] 
            for chunk in chunks : 
                chunk_strings.append (flatten (chunk)) 
return ''.join (chunk_strings) 
self.__data = flatten (flatten) 
    self.__index = 0 
    self.__length = len (self.__data) 

    
    

    Fix the buggy line: self.__data = flatten (flatten)
assistant
#Here is Python program to fix the buggy line: self.

self.__data = flatten (string_chunks)