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Functions
Functions in Go can take zero or more arguments.
To make code easier to read, the variable type comes after the variable name.
For example, the following function:
func sub(x int, y int) int {
return x-y
}
Accepts two integer parameters and returns another integer.
Here, func sub(x int, y int) int is known as the "function signature".
Assignment
We often will need to manipulate strings in our messaging app. For example, adding some personalization by using a customer's name within a template. The concat function should take two strings and smash them together.
hello+world=helloworld
Fix the function signature of concat to reflect its behavior.