what is this program trying to do main () { string1 = " ndsuece173 " ; string2 ; unknown (& string1 , & string2 ); puts ( string1 ); puts ( string2 ); } unknown ( char * s1 , char * s2 ) { while ( s1...

what is this program trying to do

main ()
{
string1 = " ndsuece173 " ;
string2 ;
unknown (& string1 , & string2 );
puts ( string1 );
puts ( string2 );
}
unknown ( char * s1 , char * s2 )
{
while ( s1 is not a NULL )
{
if ( s1 is less than 97 and greater than 122)
{
s1 ++;
continue ;
}
else
{
* s2 = * s1 - 32;
s1 ++;
s2 ++;
}
}
* s2 = ’ \0 ’;
}

could you explain reasoning