How to fix strcpy so that it detects overlapping strings

Question

In an interview, I was asked to write an implementation of strcpy and then fix it so that it properly handles overlapping strings. My implementation is below and it is very naiv

Answer 1

You could probably use memmove() if you expect the strings to be overlapping.

char* my_strcpy(char *a, char *b)
{
    memmove(a, b, strlen(b) + 1);
    return a;
}