do math

Build a function, do_math, that takes in 3 parameters: num1 (number), num2 (number), and operator (string)

• it uses the operator to determine what math to do to the numbers
  • if '+', it adds them
  • if '-', it subtracts them
  • if '*' or 'x' or 'X', it multiplies them
  • if '/', it divides them
• if then returns the result
• Example:
  • do_math(5,2,'*')
  • Return: 10