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    Chapter 3 Daily 01
    
    
    
    Design process:
- examples which turn into checkExpects
 
- signatures
 
- break down into simple pieces
 
The checks that you write should go from simple to complicated, giving
you a road map for how to build the function.
- 
ct: Convert a list of base 2 digits into an integer.
 46 == ct [1,0,1,1,1,0] 
 
- 
tobin: Convert an integer into a list of base 2 digits.
 [1,0,1,1,1,0] == tobin 46