I do not know why the output is like this!

def greet(name: String):
    name = "Hello, " + name + "!"
    print(name)

fn main():
    var name = "Mojo"
    try:
        greet(name)
    except e:
        print("Error: " , e)

Hello, Mojo!

def greet(name):
    name = "Hello, " + name + "!"
    print(name)

fn main():
    var name = "Mojo"
    try:
        greet(name)
    except e:
        print("Error: " , e)

'Hello, Mojo!