isSuperscript function
Checks if the given character is a superscript character.
Utilizes a predefined map of superscript characters, kSuperscripts,
to perform the check.
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Parameters:
character: The character to check.
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Returns:
trueifcharacteris a superscript, otherwisefalse.
Implementation
bool isSuperscript(String character) {
return kSuperscripts.values.contains(character);
}