fix : prevent duplicate values in Collatz sequence generator for cached starts

[tmdeveloper007]

Summary of What Has Been Done

In math/Collatz-Conjecture/Collatz-Conjecture.py, replaced the manual loop in the if start in steps_cache: branch of collatz_sequence with yield from get_remaining_sequence(start). The original code yielded start manually, then separately called get_remaining_sequence(n) which yielded from collatz_next(start) onward — skipping start in the remaining sequence and causing duplicate values in the final output.

Changes Made

     if start in steps_cache:
-        n = start
-        yield n
-        while n != 1:
-            n = collatz_next(n)
-            yield n
-        return
+        yield from get_remaining_sequence(start)
+        return

Impact it Made

• Correct Collatz sequence output without duplicate values when the starting number is already cached.
• All existing tests continue to pass (115/115).

Closes #1806.

Note: Please assign this PR to the tmdeveloper007 account.

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