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Transforming text
Character to character mapping, in place against out of place.
Required exercises0 / 5
5 required exercises7 optionalDifficulty 3 to 40 / 232 XP
Exercises · 12
ExerciseLevelXPStatus
flip_caseSwap the case of every letter in a string and print the result+16Newsnake_fmtConvert a camelCase identifier into underscore-separated lowercase+16Newrot_13Encode a string using the ROT13 substitution cipher+24Newrev_strchar *rev_str(char *str)+24Newalpha_foldMirror lowercase letters to their opposite, leave uppercase unchanged+24Newlast_replaceOptionalReplace only the last occurrence of a character in a string+16Newcommon_second_orderOptionalDisplay characters common to two strings, ordered by their position in the second string+16Newword_title_caseOptionalPrint each argument with the first letter of every word uppercased and the rest lowercased+16Newword_tail_capsOptionalUppercase the last alphabetic character of each word and lowercase the rest+16Newcamel_fmtOptionalConvert a snake_case identifier into lowerCamelCase format+16Newshift_alphaOptionalAdvance each letter by one position in the alphabet, wrapping z to a+24Newchar_mergeOptionalMerge two strings printing each unique character once, ordered by the second string then the first+24New