diff --git a/parsimonyLibrary/dynamicObject.mc b/parsimonyLibrary/dynamicObject.mc
index 04f60eb..a9ac778 100644
--- a/parsimonyLibrary/dynamicObject.mc
+++ b/parsimonyLibrary/dynamicObject.mc
@@ -117,7 +117,7 @@ typedef struct __oop *oop;
     nbTabs = 0;
     if (tabs != null) { nbTabs = tabs; }
     for (i = 0; i<tabs; i++) {
-      x.semicolon.comment.text = string(x.semicolon.comment.text) + "  ";
+      x.semicolon.comment.text = x.semicolon.comment.text + "  ";
     }
     x;
   }
@@ -169,11 +169,11 @@ typedef struct __oop *oop;
     }
 /*********** Method function ************/
     if (program.objects.function == "method") {
-      intern(program.objects.methods, string(program.last.declarators.declarators.identifier));
+      intern(program.objects.methods, program.last.declarators.declarators.identifier);
       for (i in program.objects.class) {
-        if (string(i) ==  string(program.objects.currentClassName)) intern(program.objects.class[i], string(program.last.declarators.declarators.identifier));
+        if (string(i) ==  program.objects.currentClassName) intern(program.objects.class[i], program.last.declarators.declarators.identifier);
       }
-      program.last.declarators.declarators.identifier = string(program.objects.currentClassName) + "_" + string(program.last.declarators.declarators.identifier);
+      program.last.declarators.declarators.identifier = program.objects.currentClassName + "_" + string(program.last.declarators.declarators.identifier);
       param = rmSemi(`declaration struct __oop *__self;);
       if (length(s.declarators.paramTypeL) > 0) {
         append(s.declarators.paramTypeL, newComma());
@@ -184,16 +184,16 @@ typedef struct __oop *oop;
       }
       tmp = {};
       // @@ problem for variable changement
-      tmp[0] = makeln(`declaration struct @@(newId(string(program.objects.currentClassName), " ")) *self = (struct @@(newId(string(program.objects.currentClassName))) *) __self;, 1);
+      tmp[0] = makeln(`declaration struct @@(newId(program.objects.currentClassName, " ")) *self = (struct @@(newId(program.objects.currentClassName)) *) __self;, 1);
       s.compoundS.expression = treeCopy(fusion(tmp, s.compoundS.expression));
       program.objects.function = "none";
       return s;
     }
 /*********** Constructor function ************/
     if (program.objects.function == "constructor") {
-      rawDeclaration = makeln(`declaration class = findClass(@@(newText("\"" + string(program.objects.currentClassName) + "\"")));, 1);
+      rawDeclaration = makeln(`declaration class = findClass(@@(newText("\"" + program.objects.currentClassName + "\"")));, 1);
       t = {};
-      append(t, treeCopy(makeln(`declaration struct @@(newId(string(program.objects.currentClassName), " ")) *self = calloc(1, sizeof *self);, 1)));
+      append(t, treeCopy(makeln(`declaration struct @@(newId(program.objects.currentClassName, " ")) *self = calloc(1, sizeof *self);, 1)));
       // take the structure of self->foo
       lhs = treeCopy(s.compoundS.expression[0].expression.lhs);
       lhs.rhs = newId("class", " ");
@@ -215,7 +215,7 @@ typedef struct __oop *oop;
         for (k in program.objects.class[i]) {
           linkedMethod  = string(program.objects.class[i][k]);
           append(t, treeCopy(makeln(`declaration int @@(newId("_selector_" + linkedMethod)) = findSelector(@@(newId("\"" + linkedMethod + "\"")));, 1)));
-          castMethod    = "(method_t) " + string(i) + "_" + string(program.objects.class[i][k]);
+          castMethod    = "(method_t) " + className + "_" + linkedMethod;
           append(t, treeCopy(makeln(`declaration addMethod(@@(newId("_class_" + className)), @@(newId("_selector_" + linkedMethod)), @@(newId(castMethod)));, 1)));
         }
       }