Added solution for 2729

Author: chirag64

02729. Check if The Number is Fascinating.rs

@@ -0,0 +1,20 @@
+impl Solution {
+    // Create concatenated string with n, 2n and 3n. Then loop through a list from 1 to 9 and if any of those digits aren't present exactly once, return false. If it has 0, return false. Else return true.
+    pub fn is_fascinating(n: i32) -> bool {
+        let mut concatenated_string = n.to_string() + &((n * 2).to_string()) + &((n * 3).to_string());
+
+        let zeroes:Vec<_> = concatenated_string.match_indices("0").collect();
+        if (zeroes.len() == 1) {
+            return false;
+        }
+        
+        for i in 1..10 {
+            let digit_occurrences:Vec<_> = concatenated_string.match_indices(&(i).to_string()).collect();
+            if digit_occurrences.len() != 1 {
+                return false;
+            }
+        }
+        
+        return true;
+    }
+}