macro needed to sum specific data in specific cells

I attached a file which explains in the comments of the cells what i exactly try to do, as a simple example >>

A B
JOHN S. 2
TOMMY 1
NASSER 2
JOHN S. 3
NADER 5

so i want the total of JOHN S. (5) to be in the Col. C and to delete the line of JOHN S. 3

this is a brief of what i try to get ,but the file that i attached is more bigger , and it will be better if it can be a MICRO not a formula

Thank you in advance