Updated problems to be more in line with conventions

Problem20.lua

@@ -1,12 +1,12 @@
 --ProjectEuler/lua/Problem20.lua
 --Matthew Ellison
 -- Created: 03-14-19
---Modified: 03-28-19
+--Modified: 06-19-20
 --What is the sum of the digits of 100!
 --All of my requires, unless otherwise listed, can be found at https://bitbucket.org/Mattrixwv/luaClasses
 --I used the bigint library from https://github.com/empyreuma/bigint.lua
 --[[
-	Copyright (C) 2019  Matthew Ellison
+	Copyright (C) 2020  Matthew Ellison
 
 	This program is free software: you can redistribute it and/or modify
 	it under the terms of the GNU Lesser General Public License as published by
@@ -30,7 +30,7 @@ TOP_NUM = 100;
 
 
 --Start the timer
-timer = Stopwatch:create();
+local timer = Stopwatch:create();
 timer:start();
 
 local num = bigint.new(1);	--The number to be generated
@@ -41,7 +41,7 @@ for cnt = 1, TOP_NUM do
 end
 
 --Get a string of the number because it is easier to pull appart the individual characters to get the sum
-numString = bigint.unserialize(num, 's');
+local numString = bigint.unserialize(num, 's');
 --Run through every character in the string, convert it back to an integer and add it to the running sum
 for cnt = 1, string.len(numString) do
 	sum = sum + tonumber(string.sub(numString, cnt, cnt));