Create problem.md

evaluation/problem.md

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+def truncate_number(number: float) -> float:
+    """ Given a positive floating point number, it can be decomposed into
+    and integer part (largest integer smaller than given number) and decimals
+    (leftover part always smaller than 1).
+    Return the decimal part of the number.
+    >>> truncate_number(3.5)
+    0.5
+    """
+