memmove() buffer manipulation copies the specified count of characters from the block of array memory pointed by "str2" to "str1". Only if the arrays overlap, the copying will be done correctly. This function returns a pointer to "str1".

    void * memmove ( void * str1, const void * str2, size_t count );

    #include <stdio.h>
   #include <string.h>
   int main ()
    {
       char str1[]="strings are fine";
       memmove(str1+8,str1+11,4); 
       printf ("String: %s\n",str1);
       return 0;
    }

    String: strings fine

In the above example, "memmove()" buffer manipulation function is used to copy the four characters "fine" alone from the block of memory.