i just need a help in doing and fixing the isalnum and strncpytests please
here is my code
#include
size_t strlen(const char *str);
int strcmp(const char * str1, const char *str2);
char* strcpy(char *dest, const char *src);
char *strncpy(char *dest, const char *src,int n);
char *strcat(char* dest, const char *src);
char *strncat(char *dest, const char* src, size_t n);
const char*strchr(const char *str, int c);
const char*strrchr(const char *str, int c);
const char * strstr(const char *str1, const char *str2);
int main()
{
char s1[] = “Hello”, s2[20], s3[] = “Hi”;
char
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