declare prototype func collision and check if robot is in the map

src/main.rs

@@ -20,6 +20,13 @@ use std::io;
 mod robot;
 mod world;
 
+fn check_map(r: &robot::Robot, w: &world::World) -> Result<(), &'static str> {}
+fn check_collisions(
+    w: &world::World,
+    r: &robot::Robot,
+    h: &collection::HashMap<robot::Position, u32>,
+) -> Result<(), &'static str> {
+}
 /// Parse the config file, generate the world and robot pool.
 fn parse_config(conf: String, pool: &mut Vec<robot::Robot>) -> Result<world::World, &'static str> {
     let mut lines = conf.lines();