diff --git a/src/YSObject.h b/src/YSObject.h
index 2488866..ff72329 100644
--- a/src/YSObject.h
+++ b/src/YSObject.h
@@ -41,6 +41,7 @@ typedef unsigned int YSUInteger;
 }
 
 -(id) init;
+-(void) dealloc;
 
 @end
 
diff --git a/src/YSString.h b/src/YSString.h
index 52d64e9..4f39339 100644
--- a/src/YSString.h
+++ b/src/YSString.h
@@ -1,27 +1,29 @@
 #ifndef YSSTRING_H
 #define YSSTRING_H
 
-#import <YSObject.h>
-#import <YSRange.h>
-
-#include <stdio.h>
-
-@implementation YSString : YSObject <YSCopying, YSMutableCopying>
-+(instancetype) string;
-+(instancetype) stringWithCharacters: (const unichar*) chars
-                length: (YSUInteger) length;
-+(instancetype) stringWithCString: (const char *) byteString
-                length: (YSUInteger) length;
-+(instancetype) stringWithCString: (const char *) byteString;
-//+(instancetype) stringWithFormat: (YSString *)format, ... 
-+(instancetype) stringWithContentsOfFile: (YSString *) path;
--(instancetype) init;
--(YSUInteger) length;
--(unichar) characterAtIndex: (YSUInteger) index;
--(void) getCharacters: (unichar *) buffer;
--(void) getCharacters: (unichar *) buffer
-        range: (YSRange) aRange;
+#import "YSObject.h"
+
+@interface YSConstantString : YSObject {
+        char *c_string;
+        unsigned int len;
+}
+
+-(const char *) cString;
+-(unsigned int) length;
+-(void) dealloc;
+
 @end
 
+/*
+@interface YSString : YSObject {
+    char *c_string;
+    unsigned int len;
+}
+
+-(char *) cString;
+-(unsigned int length);
+
+@end
+*/
 
 #endif
\ No newline at end of file
diff --git a/src/YSString.m b/src/YSString.m
new file mode 100644
index 0000000..09320e9
--- /dev/null
+++ b/src/YSString.m
@@ -0,0 +1,18 @@
+#import "YSString.h"
+
+@implementation YSConstantString
+-(const char *) cString {
+    return (c_string);
+}
+
+-(unsigned int) length {
+    return len;
+}
+
+//free(): invalid pointer
+-(void) dealloc {
+    //[super dealloc];
+    free(c_string);
+}
+
+@end
\ No newline at end of file