Write a C function f that

• accepts, as input, one unsigned long int N
  • assume that the decimal representation of N is the sequence of digits d_n d_n1 d_n2 d₂ d₁ d₀
    • where d_n is the leftmost non-zero digit and d₀ is the rightmost digit
• yields, as its output
  • the integer whose decimal representation is the sequence of digits d_n1 d_n2 d₂ d₁ d₀ d_n
• has the prototype
  • unsigned long int f ( unsigned long int N ) ;