A new task for you!

You have to create a method, that corrects a given time string.
There was a problem in addition, so many of the time strings are broken.
Time-Format is european. So from "00:00:00" to "23:59:59".


Some examples:

"09:10:01" -> "09:10:01"
"11:70:10" -> "12:10:10"
"19:99:99" -> "20:40:39"
"24:01:01" -> "00:01:01"

If the input-string is null or empty return exactly this value! (empty string for C++)
If the time-string-format is invalid, return null. (empty string for C++)

Have fun coding it and please don't forget to vote and rank this kata! :-) 

I have created other katas. Have a look if you like coding and challenges.

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'def time_correct(t):\n    # check for emptiness\n    if not t:\n        return t\n    # check only for the allowed symbols\n    for i in t:\n        if i not in "1234567890:":\n            return None\n    # check for length\n    slot = t.split(":")\n    for k,i in enumerate(slot):\n        try:\n            if len(slot[k])>2:\n                return None\n            slot[k]=int(slot[k])\n        except ValueError:\n            return None\n    if len(slot)!=3:\n        return None\n    # point, you can\'t iterate, 24 - h, 60 - m,s \n    slot[1] += slot[2]//60 \n    slot[0] += slot[1]//60 \n    slot[2] = slot[2]%60\n    slot[1] = slot[1]%60\n    slot[0] = slot[0]%24 \n    return ":".join([str(x).zfill(2) for x in slot])\n    \n    # https://stackoverflow.com/questions/733454/best-way-to-format-integer-as-string-with-leading-zeros\n'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'time_correct'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 5808