Write a function sum_col(f) that takes a filename f. Each line in f contains three comma-separated numbers. You should write at the end of the file the sum of the odd rows of each column in the file.
Example file ('example.txt'):
1,2,3
4,5,6
-1,2,0
10,20,13
5,3,4
For the following function call Sum_col('example.txt') the 'example.txt' file will be updated to the following: 1,2,3
4,5,6
-1,2,0
10,20,13
5,3,4
Totals:
5,7,7
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