Function that print minimum number of swap operations required
static void MinimumSwapOperations ( String s ) { boolean zero_exist = false ; boolean multiple_of_2 = false ; int sum = 0 ; int index_of_zero = 0 ; boolean more_zero = false ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { int val = s . charAt ( i ) - '0' ;