Case Sensitive IF?

Heres the code


#SingleInstance, force



RAlt:: gosub, Accatures ; Accents + Ligatures = Accetures



Accatures:
clipboard := ""
SendInput, +{Left 2}^c{Del}
sleep, 64
aChar = %clipboard%
stLenth := StrLen(achar)

if stLenth = 2
{
	MatchandReplace(aChar)
} 
else
{
	SendInput, ^v
	return
}

return
;

MatchandReplace(CharSet)
{
	

if CharSet = 'E ; Acute
	Send, {asc 0201}
else if CharSet = 'e
	Send, {asc 0233}
else if CharSet = ``A ; Grave
	Send, {asc 0192}
else if CharSet = ``a
	Send, {asc 0224}
else if CharSet = ``E
	Send, {asc 0200}
else if CharSet = ``e
	Send, {asc 0232}
else if CharSet = ``U
	Send, {asc 0217}
else if CharSet = ``u
	Send, {asc 0249}
else if CharSet = ^A ; Circumflex  
	Send, {asc 0194}
else if CharSet = ^a
	Send, {asc 0226}
else if CharSet = ^e
	Send, {asc 0202}
else if CharSet = ^E
	Send, {asc 0234}
else if CharSet = ^I
	Send, {asc 0206}
else if CharSet = ^i
	Send, {asc 0238}
else if CharSet = ^O
	Send, {asc 0212}
else if CharSet = ^o
	Send, {asc 0244}
else if CharSet = ^U
	Send, {asc 0219}
else if CharSet = ^u
	Send, {asc 0251}
else if CharSet = :E ; Diaeresis
	Send, {asc 0203}
else if CharSet = :e
	Send, {asc 0235}
else if CharSet = :I
	Send, {asc 0207}
else if CharSet = :i
	Send, {asc 0238}
else if CharSet = :U
	Send, {asc 0220}
else if CharSet = :u
	Send, {asc 0252}
else if CharSet = :Y
	Send, {asc 0159}
else if CharSet = :y
	Send, {asc 0255}
else if CharSet = ,C ; Cedille
	Send, {asc 0199}
else if CharSet = ,c
	Send, {asc 0231}
else if CharSet = ~N ; Tilde
	Send, {asc 0209}
else if CharSet = ~n
	Send, {asc 0241}
else if CharSet = OE ; Ligatures
	Send, {asc 0140}
else if CharSet = oe
	Send, {asc 0156}
else if CharSet = AE
	Send, {asc 0198}
else if CharSet = ae
	Send, {asc 0230}  
else if CharSet = << ; Quotation 
	Send, {asc 0171}
else if CharSet = >>
	Send, {asc 0187}
else 
	Send {asc 0020}
}

But, being case insensitive, auto hotkey reads 'e and 'E as the same...

How can I fix that?

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