Compute the sum of all numeric digits in the given text. Ignore non digit characters. Return 0 for an empty string. Return null for null input.
Examples:
Input: text = "12345"
Output: 15
Explanation: 1 + 2 + 3 + 4 + 5 = 15
Input: text = "a1b2c3"
Output: 6
Explanation: Only digits are counted 1 + 2 + 3 = 6
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