Align/indent let expressions as directed in
  http://www.cs.tufts.edu/comp/105/handouts/mlstyle.pdf
Convert Variable (& function) names to camelCase as directed in
  http://www.cs.tufts.edu/comp/105/handouts/mlstyle.pdf
Convert if statements to case as directed in
  http://www.cs.tufts.edu/comp/105/handouts/mlstyle.pdf
Remove superfluous semicolons as directed in
  http://www.cs.tufts.edu/comp/105/handouts/mlstyle.pdf