init with 2019 - day1 - part 1

2019/day1/.gitignore

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+/target

2019/day1/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "day1"
+version = "0.1.0"

2019/day1/Cargo.toml

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+[package]
+name = "day1"
+version = "0.1.0"
+authors = ["genofire <geno+dev@fireorbit.de>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2019/day1/src/main.rs

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+fn main() {
+    let all_modules: [u32; 100] = [
+        83568, 132382, 65095, 105082, 138042, 59055, 79113, 123950, 59773, 55031, 56499, 122835,
+        123608, 82848, 109981, 115633, 126241, 137240, 54983, 129523, 101517, 90879, 82446, 105897,
+        108653, 130530, 113607, 140338, 125646, 112605, 68080, 105466, 93462, 147116, 127370,
+        128362, 83129, 146946, 102658, 62824, 52950, 119301, 61671, 92820, 139579, 93816, 148535,
+        77893, 80523, 69543, 51773, 144074, 100340, 64565, 68404, 88923, 144824, 87836, 51209,
+        99770, 111044, 144978, 56585, 137236, 73290, 86608, 72415, 57783, 130619, 109599, 59655,
+        99708, 118488, 104989, 93812, 135899, 110396, 89346, 119482, 67292, 143810, 64085, 104169,
+        145618, 104035, 75765, 88638, 139325, 89099, 132807, 117255, 98029, 114780, 104708, 100671,
+        98052, 141263, 149844, 117643, 123410,
+    ];
+
+    let mut result = 0;
+    for i in all_modules.iter() {
+        result += fuel_calc(*i);
+    }
+    println!("I need {} fuel for all modules", result);
+}
+
+fn fuel_calc(mass: u32) -> u32 {
+    mass / 3 - 2
+}
+
+#[test]
+fn test_it() {
+    assert_eq!(fuel_calc(12), 2);
+    assert_eq!(fuel_calc(14), 2);
+    assert_eq!(fuel_calc(1969), 654);
+    assert_eq!(fuel_calc(100756), 33583);
+}