Write a function that takes three numbers, a, b, and c, and returns the largest of the three. You are not allowed to use any built-in maximum-finding functions or methods provided by the language's standard library.
a = 5
b = 2
c = 8
8
8 is greater than 5 and 2.
a = 10
b = 10
c = 7
10
10 is the largest, even with duplicates.
a = -1
b = -5
c = -3
-1
-1 is the largest among the negative numbers.
a = 5
b = 2
c = 8
8