I need help in understanding this thoroughly and simply. For each photo there are two comments saying what does this program do? and what does this function do? I need these questions answered. And any extra information just to help me understand better is much appreciated but not mandatory thank you.

1 Program a: What does this program do? / #include 4.11 void mystery!( char *s1, const char *s2 ); /* prototype */ 8 {char striel 80);/* create char array / 6 int main( void ) ] " create char array "/ 9char string2t 80 1; 10 create char array 12 printf ( "Enter two strings: ) 12 13 14 15 printf( " Enter two strings: scant( "%s%s" , mystery1( stringi, string2); printf("%s", string1 ); return e;V-indicates successful termination */ string1, string2 ); 16 17" end main / 18 19 What does this function do? " 20 void mystery1( char "s1, const char "s2) 21 while ( "s1 e) 23 s1+t; 24/" end while "/ 25 for ( ; "s1 *s2; s1++, s2++ ) { 6- 27 28 29 ; / empty statement / end function mysteryl / ) /" end for "/