how do i write the following functions:can somebody help me with this programm?

int lengthOfString(char *string);

the longer the text that is given,the longer the text caculation

int letsFactorise(int charCount);

the length of the texts in order of prime number,if no prime numbers then give Error-code back.

void createMatrix(char *string);

the aready calculated prime numbers,the texts in transponetial matrix transformed.

void getStdin();

i can write till EOF(-1)

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You just set yourself a date with SPAM. Good luck!