Trim before and after space char from string

**Is your feature request related to a problem? Please describe.**
System.Strin.Trim() don't trim before space char.
But user input has befaore space.

**Describe the solution you'd like**
Trim method is to change to remove before and after space char.
And removing space char type is half and full with.

**Describe alternatives you've considered**
I think to implement extension method.