TrimString.rb

=begin

Return a function that will trim a string (the first argument given) if it is
longer than the maximum string length (the second argument given). The result
should also end with "..."

These dots at the end also add to the string length.

So in the above example, trim("Creating kata is fun", 14) should return
"Creating ka..."

If the string is smaller than or equal to 3 characters then the length of the
dots is not added to the string length.

e.g. trim("He", 1) should return "H..."

If the string is smaller or equal than the maximum string length, then simply
return the string with no trimming or dots required.

e.g. trim("Code Wars is pretty rad", 50) should return "Code Wars is pretty rad"

=end

# My Solution
def trim(string, size)
  return string if size >= string.length
  num = (size - 4)
  num = size-1 if num < 0
  "#{string[0..num]}..."
end

# Better Solution
def trim(string, size)
  return string if string.size <= size
  size -= 3 if string.size > 3 && size > 3
  "#{string[0...size]}..."
end