// We declared `ford` instance using `let` (immutable now) i.e we are not gonna change its content
let ford = Car(name:"Ford", model:"2010", color:"Red")
// Ford instance being copied by ferrari i.e ferrari and ford have two different copies
// We declared `ferrari` instance using `var` (mutable now). In Struct, it always behaves like immutability so we have to declare his instance (i.e ferrari) and variable (i.e name) using `var` only to get mutable behavior