[C] How to copy point char to anther point char

#include<stdio.h>
#include<string.h>

void CopyPointer(char *a)
{
    char *tmp = (char *) strdup(a);

    printf(" a = %s\n",a);
    printf(" tmp = %s\n",tmp);
    printf(" tmp = %s\n",tmp+1);

}


int main()
{
    char a[] = "happy";

    CopyPointer(a);
    printf(" a   %s\n",a);
}

Result

 a = happy
 tmp = happy
 tmp = appy
 a   happy

Reference:

• lib/nstrcmp.c