refactored find_sum for ex2.3-7 ★ 	modified:   ch02/binary_search.hpp
refactored find_sum for ex2.3-7 ★
	modified:   ch02/binary_search.hpp

opensourceDA/CLRS,tushar2708/CLRS,opensourceDA/CLRS,Mooophy/CLRS,Mooophy/CLRS,tushar2708/CLRS,opensourceDA/CLRS,opensourceDA/CLRS,Mooophy/CLRS,tushar2708/CLRS,Mooophy/CLRS,tushar2708/CLRS