Write a function that takes a multi dimensional array as input. The diagonal of the array consists of zeros. Assign the sum of each row to the diagonal element of that row.

Example:

Original array:

0 6 7 8 

6 0 8 9 

7 8 0 10

8 9 10 0

 

result is:

21 6 7 8 

6 23 8 9 

7 8 25 10

8 9 10 27