Rustlang quick helpful rules

Some Helpful Rust Things

- There can be only one owner of a value

- Ownership of a value can be given to something else. When this is done through re-assignment, it is called Move semantics. 

- However, primitive types like integers that have the Copy trait already implemented for them will be copied when re-assigned. 
  These are called Copy Types.

- Passing a value directly to a function gives ownership to that function

- Values initialized within a function WILL BE DROPPED AT THE END OF THE FUNCTION except you go out of your way to return it.

- A value can be lent to a something else. This is done by passing a reference to the value with the & symbol

- When calling a function that returns a value, you might get an owned value or a borrowed value. 
  When you have a borrowed value, it means it is a reference

- Cloning a value is frowned upon

- Return value of a function is the last expression in the function without semicolon. Very important

- println! has to be a macro instead of a function because it has to check its variable number of arguments at compile time

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