Fixes for Integer Overflows

[avritichauhan]

Added the fixes for integer overflow issues raised in #1173, for the benchmarks submitted in PR #835

• programs added to new and appropriately named directory

• license present and acceptable (either in separate file or as comment at beginning of program)

• contributed-by present (either in README file or as comment at beginning of program)

• programs added to a .set file of an existing category, or new sub-category established (if justified)

• intended property matches the corresponding .prp file

• programs and expected answer added to a .yml file according to task definitions

• data model present in task-definition file
• original (ideally not preprocessed) sources present
• preprocessed files present
• preprocessed files generated with correct architecture
• Makefile added with correct content and without overly broad suppression of warnings

[avritichauhan]

@divyeshunadkat @hernanponcedeleon @PhilippWendler @dbeyer

I have added the necessary fixes. A kind request to review the changes, so that the PR can be merged.

[divyeshunadkat]

Thanks @avritichauhan for the PR with the necessary changes