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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