fix vec trail

src/flag_utils.rs

@@ -0,0 +1,16 @@
+pub fn get_flags(flags: i32) -> Vec<i32> {
+    let mut fvec: Vec<bool> = Vec::new();
+    let mut rest = flags;
+    while rest != 0 {
+        fvec.push((rest % 2) != 0);
+        rest = rest / 2;
+    }
+
+    let mut tvec: Vec<i32> = Vec::new();
+    for (i, value) in fvec.iter().enumerate() {
+        if *value {
+            tvec.push(i as i32);
+        }
+    }
+    tvec
+}