Consider the following C-program: 1 #include 2 #include 3 #include 4 5 void foo (char *s, int d) { 6 7 8 int i=0; char *t= malloc(d); while (id) { 9 10 11 } 12 13 14 15 } 16 = t[i]s[d-i-1]; i++; for (i=0; i Explain, use one sentence to explain the purpose of this program to a layperson. Explain why the foo function requires the d parameter to be passed to it. What does the foo function return? What is the output of this program when it is executed?