#ifndef _C_STRING_H
#define _C_STRING_H

typedef unsigned int size_t;

size_t strlen(const char *str);
char* strcpy(char *dest, const char *src);
char* strncpy(char *dest, const char *src, size_t num);
char* strcat(char *dest, const char *src);
int strcmp(char *str1, char *str2);
int strncmp(char *str1, char *str2, size_t num);
const char* strchr(const char *str, char ch);
const char* strstr(const char *str1, const char *str2);

#endif