fix: get rid of dependency bug in project

The last change in the project introduced an a
refactor that lead to the new bug tht crashed the
program. With this, the program should run once
again smoothly as before.

src/lua/calculations.lua

@@ -1,5 +1,5 @@
 require "math"
-require "input_utils"
+local input_utils = require("input_utils")
 
 local Triangle = {}
 Triangle.__index = Triangle
@@ -29,7 +29,7 @@ end
 
 function Triangle:getArea()
 	local halved_perimeter = self:getPerimeter()/2
-	return math.sqrt(halved_perimeter * (halved_perimeter - self.side_one) * (halved_perimeter - self.side_two) * (halved_perimeter - self.side_three))
+	return math.sqrt(halved_perimeter * (halved_perimeter - self.sides[1]) * (halved_perimeter - self.sides[2]) * (halved_perimeter - self.sides[3]))
 end
 
 function Triangle:isTriangle()

src/lua/input_utils.lua

@@ -1,6 +1,8 @@
 require "io"
 
-function getInput()
+local utils = {}
+
+function utils.getInput()
 	local value = io.read()
 	local results = tonumber(value)
 	if results == nil then
@@ -9,4 +11,6 @@ function getInput()
 	elseif type(results) == "number" then
 		return results
 	end
-end
+end
+
+return utils