Good afternoon,

Got problem with implementing a function that works like str.split method,
Cannot resolve specific assert, where upon repeating symbols in separator are not counted properly.

Expected output is [‘set’, ”, ’23’], but upon my code-solution I receive [‘set’, ’23’]

from typing import List

def split(data: str, sep=None, maxsplit=-1):
    
    if data == '':
        return []
    if sep is None:
        sep = ' '
    if maxsplit == 0:
        return [data.strip()] 

    parts = []
    current_part = ''
    split_count = 0
    sep_length = len (sep) 
    counter = 0


    while data and data[counter] == ' ':
        counter+=1
    while counter < len(data):
        if data[counter:counter+sep_length] == sep:
            if split_count < maxsplit or maxsplit == -1:
                parts.append(current_part)
                split_count += 1
                while data[counter:counter+sep_length] == sep:
                    if counter < len(data):
                        counter += sep_length
                        
                current_part = ''
            else:
                current_part += data[counter]
                counter += 1
        else:
            current_part += data[counter]
            counter += 1

    parts.append(current_part)
    print (parts)
    return parts


if __name__ == '__main__':
    assert split('') == []
    assert split(',123,', sep=',') == ['', '123', '']
    assert split('test') == ['test']
    assert split('Python    2     3', maxsplit=1) == ['Python', '2     3']
    assert split('    test     6    7', maxsplit=1) == ['test', '6    7']
    assert split('    Hi     8    9', maxsplit=0) == ['Hi     8    9']
    assert split('    set   3     4') == ['set', '3', '4']
    assert split('set;:23', sep=';:', maxsplit=0) == ['set;:23']
    assert split('set;:;:23', sep=';:', maxsplit=2) == ['set', '', '23']

I tried to reformat conditions on counting consecutive separators, but failed to return results properly