-#ifndef CTYPES_H_
-#define CTYPES_H_
+#ifndef CTYPE_H_
+#define CTYPE_H_
int isalnum(int c);
int isalpha(int c);
int isalnum(int c);
int isalpha(int c);
int toupper(int c);
int tolower(int c);
int toupper(int c);
int tolower(int c);
-
-#endif /* CTYPES_H_ */