Turning a set of string to constant case

[it_begins]

Help needed urgently.
I have a question that needs to change a set of strings to constant case. That is replacing spaces with underscores, removing punctuations, and capitalizing all letters. using only these string functions: are: charAt(), length(), toUpperCase(), toLowerCase(). The only Character class functions allowed are: isAlphabetic(), isLetter(), isSpaceChar(), isUpperCase(), isLowerCase(), toUpperCase(), toLowerCase().
Thank you…

[glv]

This topic is cross-posted (related content and urgency) here:

Changing a normal string to camelCase

Hi, i have to change a set of string to calmelcase i.e removing punctuations and spaces,and capitalizing the first letter of each word… Using only these string functions: charAt(), length(), toUpperCase(), toLowerCase(). The only Character class functions are: e: isAlphabetic(), isLetter(), isSpaceChar(), isUpperCase(), isLowerCase(), toUpperCase(), toLowerCase(). Help needed urgently, thank you in advance.