Reorder days into src

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+--- Part Two ---
+
+During the second Go / No Go poll, the Elf in charge of the Rocket Equation Double-Checker stops the
+launch sequence.  Apparently, you forgot to include additional fuel for the fuel you just added.
+
+Fuel itself requires fuel just like a module - take its mass, divide by three, round down, and
+subtract 2.  However, that fuel also requires fuel, and that fuel requires fuel, and so on.  Any
+mass that would require negative fuel should instead be treated as if it requires zero fuel; the
+remaining mass, if any, is instead handled by wishing really hard, which has no mass and is outside
+the scope of this calculation.
+
+So, for each module mass, calculate its fuel and add it to the total.  Then, treat the fuel amount
+you just calculated as the input mass and repeat the process, continuing until a fuel requirement is
+zero or negative. For example:
+
+
+ - A module of mass 14 requires 2 fuel.  This fuel requires no further fuel (2 divided by 3 and
+rounded down is 0, which would call for a negative fuel), so the total fuel required is still just
+2.
+
+ - At first, a module of mass 1969 requires 654 fuel.  Then, this fuel requires 216 more fuel (654 /
+3 - 2).  216 then requires 70 more fuel, which requires 21 fuel, which requires 5 fuel, which
+requires no further fuel.  So, the total fuel required for a module of mass 1969 is 654 + 216 + 70 +
+21 + 5 = 966.
+
+ - The fuel required by a module of mass 100756 and its fuel is: 33583 + 11192 + 3728 + 1240 + 411 +
+135 + 43 + 12 + 2 = 50346.
+
+
+What is the sum of the fuel requirements for all of the modules on your spacecraft when also taking
+into account the mass of the added fuel? (Calculate the fuel requirements for each module
+separately, then add them all up at the end.)
+
+