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Strings

string-upcase str Function
Return a new string where the letters in str are replaced by their upper-case equivalents.

string-downcase str Function
Return a new string where the letters in str are replaced by their lower-case equivalents.

string-capitalize str Function
Return a new string where the letters in str that start a new word are replaced by their title-case equivalents, while non-initial letters are replaced by their lower-case equivalents.

string-upcase! str Function
Destructively modify str, replacing the letters by their upper-case equivalents.

string-downcase! str Function
Destructively modify str, replacing the letters by their upper-lower equivalents.

string-capitalize! str Function
Destructively modify str, such that the letters that start a new word are replaced by their title-case equivalents, while non-initial letters are replaced by their lower-case equivalents.