code explanation c++ [struct / two diamentinal array / pointers]

I'm new to c++ and its developing.i have two methods void accumulation(void) & void chartest( char * nam) accumulation is called in my main.cpp file.

void accumulation(void)
{
  char * test[] ={"Rehan ","Kalpana"};
  chartest(&test[0][1]);
}

void chartest( char * nam)
{
    printf("char name -> %s \n",nam);
}

i changed the values in chartist as follows then i got output as follows

chartist(&test[0][1] - char name -> ehan
chartest(&test[1][1])-char name -> alpana
chartest(&test[1][0]) -char name -> Kalpana
chartest(&test[0][0])- char name -> Rehan

can anyone please explain why this happens. it will help me a lot. thank you