quickly Please I want help as soon as possible I do not have time, quickly I only have ten minutes!!!

Given the underneath fragment code that is written in C language, Write down the function with domain and codomain then prove that function is injective (One to one) but it's not surjective (Onto)? SHOW ALL YOUR WORKS, a counterexample is NOT ENOUGH, you have to disprove surjectivity and prove injective. void fun (unsigned int *m unsigned int *n}{ *m=5* (*m) +(*n); *n=f*n) * (*n)