Created file arithmetic to demonstate basic of function creation
added is_numeric check to each function
Validated Divide by 0 errors. created own 0 error message
Changed error messages to interpolate variables from function
Refactored the error message as a function to call error function as error message
Added ternary operator to divide function and deleted unused lines
Test file
Added file list_with_commas
trying to correct error
Moved functions to the top and Excutions to the Bottom
Added new file blackhand to create function that reads BlackJack Hand
added file search_arrays
added file list_with_commas to learn Explode/Implode functions
Added file sorting to demonstrate sort functions with arrays