function to check collisions at given position

src/main.rs

@@ -14,6 +14,7 @@
 // along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 use clap::{App, Arg};
+use std::collections::HashMap;
 use std::fs;
 use std::io;
 
@@ -28,7 +29,19 @@ fn check_map(r: &robot::Robot, w: &world::World) -> Result<(), String> {
         Ok(())
     }
 }
-
+fn check_collisions(
+    r: &robot::Robot,
+    w: &world::World,
+    h: HashMap<&robot::Position, &u32>,
+) -> Result<(), String> {
+    match h.get(&r.p) {
+        Some(&x) => Err(format!(
+            "The robot id: {} collided with robot id: {} in position: ({};{}).",
+            &r.id, x, &r.p.x, &r.p.y
+        )),
+        None => Ok(()),
+    }
+}
 /// 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();