Write a program in C language that calculates the result of an arithmetic operation according to Polish notation. The input of the program will be a text like $*+*+12+3456.$ A SPACE will be used as a separator in the text. The output of the program is the result of the four operations. The output of the above example is $156$ Libraries other than basic libraries $($string$.$h$,$ etc.$)$ will not be accepted $($regex$,$ etc.$).$It would be nice if there is a detailed explanation.