Polygon Volume CALLLLLC

-- calculate the volume of a polygon

local sides = 5
local length_of_one_side = 8
local height = 8
local ex = 5.5
local unit = "in"

function removedeci(x)
    local y = tostring(x)
    for i=1,#y do
        if string.sub(y,i,i) == "." then
            if string.sub(y,i+1,i+1) == "0" and string.sub(y,i+2,i+2) == "" then
                return tonumber(string.sub(y,1,i-1))
            end
        end
    end
    return x
end


--calculations
local fric = sides*length_of_one_side
local frac = tostring(sides)..unit.." * "..length_of_one_side..unit.." = "..removedeci(fric)..unit.."²"
local fric2 = 0.5*(ex)*(fric)
local frac2 = "½ * "..ex..unit.." * "..removedeci(fric)..unit.."² = "..removedeci(fric2)..unit.."²"
local fric3 = fric2*height
local frac3 = tostring(removedeci(fric2))..unit.."²".." * "..height..unit.." = "..removedeci(fric3)..unit.."³"
print(frac.."\n"..frac2.."\n"..frac3.."\n----------------------------\nAnswer:")

print(removedeci(fric3)..unit.."³")