Add day 1 part 2 (awk)

2019/1/day1_2.awk

@@ -0,0 +1,16 @@
+#!/usr/bin/awk -f
+
+function calc_fuel(mass) {
+    return int(mass / 3) - 2;
+}
+
+{
+    c = calc_fuel($1);
+    while (c > 0) {
+        s += c;
+        c = calc_fuel(c);
+    }
+}
+END {
+    print s;
+}