To I achieve iteration solution in C++

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C++

I am writing a code in the following function(detectHappy) that will check whether a number is a happy number or not, for 10 cycles (iterations) only. My function should :

-Find the sum of the digits of the number.

-Check the result obtained in point 1. If it is 1, assign value 1 to the variable 'finalNumber', else again execute point 1, till the number obtained is 1 or till the number of cycle increases to 10.

-Assign the iteration value to the variable 'cycle_no'.

I am not supposed to input, output or declare any additional functions. I just have to write the body of the function already declared there that will make it work on the shell offered in my course...

The programme I have attempted to write compiles but does not give the correct results (e.g number 6 generates the value 32765 after 10 cycles instead of the expected 145. I am now short of ideas and I will be grateful for any assistance. Thank you in advance.

What I have tried:

/*Question      : Write your code to find whether the number is a happy number or not (for max 10 cycles).
int number      : The number to be determined whether it is happy or not
int finalNumber : Store the resultant value in this variable
int cycle_no    : Store the number of iterations done to determine whether the 'number' is happy or not */

void detectHappy(int number, int &finalNumber, int &cycle_no) {

    //Write your solution code below this line
    int sum = 0;
    int i = 1;
    do{
        sum += (number%10)*(number % 10);
        number /=10;
        if (sum == 1){
            finalNumber = 1;
            break;
        }
        else {
            number = sum;
            ++number;
        }
        cycle_no = ++i;
    }
    while (i < 10);
}