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int SumDigits (string strInput) {
int index = 0;
int sum = 0;
int strLen = (int)strInput.length();
while (index < strLen) {
char character = strInput[index];
int number = character;
number = number - '0'; // convert character code (ASCII) to integer
sum = number + sum;
index ++;
}
return sum;
}