Use reference counting for identifiers

src/New/Arg/FunctionRef.c

@@ -1,25 +1,8 @@
 #include "../../../include/ground.h"
 
-#include <string.h>
-#include <stdlib.h>
-
-GroundArg _GroundNewArgFunctionRef(const char* ref) {
-    size_t len = strlen(ref);    
-    char* copy = malloc(len + 1);
-
-    if (copy == NULL) {
-        Ground.Log.Error("malloc failed in Ground.New.Arg.FunctionRef()");
-        Ground.Flags.error = true;
-        return (GroundArg) {
-            .type = GroundArg_DirectRef,
-            .as.ref = ""
-        };
-    }
-
-    strcpy(copy, ref);
-
+GroundArg _GroundNewArgFunctionRef(GroundIdentifier* ref) {
     return (GroundArg) {
         .type = GroundArg_FunctionRef,
-        .as.ref = copy
+        .as.ref = Ground.Copy.Identifier(ref) 
     };
 }