Data structures C++

The free newString() takes string objects strA and strB as arguments. For its action, newString() compares the string by using < and returns the concatenation of the arguments, with the lesser sring coming first.
a) give a function prototype for newString()
b)Give the implementation for newString()
c) The main program has the following string declarations, which should be used for parts (i) and (ii)
              sring A = "String", B = "cat";
  i) cout<< newString(A,B) //Output:_________
ii) cout<< newString(A,"C++"); // Output: _______