Removed tabs and clean up ws in ast

lab3-4/ast.cc

@@ -241,7 +241,7 @@ void BinaryOperation::xprint(ostream& o, const char *cls)
     endChild(o);
 }
 
-void Plus::print(ostream& o) { xprint(o, "Plus"); } // 
+void Plus::print(ostream& o) { xprint(o, "Plus"); } //
 void Minus::print(ostream& o) { xprint(o, "Minus"); }
 void Times::print(ostream& o) { xprint(o, "Times"); }
 void Divide::print(ostream& o) {xprint(o, "Divide"); }
@@ -328,7 +328,7 @@ void BinaryCondition::xprint(ostream& o, const char *cls)
 }
 
 void And::print(ostream& o) { xprint(o, "And"); }
-void Or::print(ostream& o) { xprint(o, "Or"); } // 
+void Or::print(ostream& o) { xprint(o, "Or"); } //
 
 void Not::print(ostream& o)
 {