Need help on my conditional logic (to switch or not to switch, that is the question)

Question

I'm trying to write a function that will evaluate two variables, $misc1 and $misc2, they may or may not contain text. Essentially the possible outcomes are this:
1) $Misc1 is blank and $Misc2 is blank
2) $Misc1 is blank and $Misc2 has data
3) $Misc1 has data and $Misc2 is blank
4) $Misc1 has data and $Misc2 has data
if 1, return $null
if 2, return the value of $misc2 + 5 blank spaces
if 3, return the value of $misc1 + 5 blank spaces
if 4, return the value of $misc1 + 5 blank spaces + $misc2
Can I switch this, or does that only work on a single variable?
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Answer 1

Thank you mdkelley, ended up with this:
Function Misc-Blank
Param
[string]$Misc1 = $Misc1,
[string]$Misc2 = $Misc2
if(([string]::IsNullOrWhiteSpace($Misc1)) -and ([string]::IsNullOrWhiteSpace($Misc2))){return,$null}
if(([string]::IsNullOrWhiteSpace($Misc1)) -and (-not [string]::IsNullOrWhiteSpace($Misc2))){return, " $misc2"}
if((-not [string]::IsNullOrWhiteSpace($Misc1)) -and ([string]::IsNullOrWhiteSpace($Misc2))){return, " $misc1"}
if((-not [string]::IsNullOrWhiteSpace($Misc1)) -and (-not [string]::IsNullOrWhiteSpace($Misc2))){return, "$misc1 $misc2"}
[email protected]