Modify Binary Search in C

[2Clutch]

I Am Modifying an Existing Code Snippet or Existing Tests

• I fixed Modify Binary Search in C #3956
• I have read about modifying existing code snippets or tests in the [contributing documentation][contributing-modifications]
• I have explained why this modification is necessary either in the issue linked above or in the notes below
• I named the pull request using Modify {PROJECT} {tests} in {LANGUAGE} format

[rzuckerm]

The error message for unsorted and invalid number still needs to say this:

Usage: please provide a list of sorted integers ("1, 4, 5, 11, 12") and the integer to find ("11")

Please see this for details on the failures.

[rzuckerm]

Thanks, @2Clutch , looks good!