Enabled equatable for tuple

Sources/AOC2018/tools.swift

@@ -14,10 +14,10 @@ func XCTAssertEqual(test: String, withExpression isTrue: Bool) {
     print(test)
 }
 
-func == <T:Equatable> (tuple1:(T,T),tuple2:(T,T)) -> Bool
+// func == <T:Equatable> (tuple1:(T,T),tuple2:(T,T)) -> Bool
-{
+// {
-   return (tuple1.0 == tuple2.0) && (tuple1.1 == tuple2.1)
+//    return (tuple1.0 == tuple2.0) && (tuple1.1 == tuple2.1)
-}
+// }
 
 struct Tools {
     static func readFile(fromPath path: String) -> String {
@@ -57,9 +57,9 @@ extension StringProtocol {
         return compactMap { $0.ascii }
     }
 
-    // subscript(offset: Int) -> Element {
+    subscript(offset: Int) -> Element {
-    //     return self[index(startIndex, offsetBy: offset)]
+        return self[index(startIndex, offsetBy: offset)]
-    // }
+    }
 }
 
 extension String {