Variant functions are inefficient by nature, and should not be used with strings when string-specific versions, denoted by a $ at the
end of the name, are available.
This rule flags instances of these functions:
Left(), Mid(), Right(), Chr(), ChrW(), UCase(), LCase(),
LTrim(), RTrim(), Trim(), Space(), String(), Format(),
Hex(), Oct(), Str(), Error
Noncompliant code example
TrimString = Trim(TestString)
Compliant solution
TrimString = Trim$(TestString)
