Generic runner for c programs.

Hand in filename as first argument (generally map a key in vim)
This script will:
  - clear screen
  - make current file
  - run current file reading from appropriately name input file

Naming convention:
  If problem is name foo.c, input file is named foo.in
Solution for PizzaPricing Question from Contest.

Redone in C for practice.
Refactor: Pizza Pricing
- Extracted printing into a single function