C: binsearch function
Added test driver to binsearch function which comes from K&R C. test result: $ binsearch v1[] = 4 2 5 6 8 2 34 12 23 10 The index of number 8 in v1[]: 4
Added test driver to binsearch function which comes from K&R C. test result: $ binsearch v1[] = 4 2 5 6 8 2 34 12 23 10 The index of number 8 in v1[]: 4