my function in mylib

• read first line from *file and return fist &line

void readFirstLine(char *file, char *line);

• read nth line from *file and return the nth &line

void readOneLine(char *file, char *s, int N);

• read int from *file and return x

int fgetint(char *file);

• read *file and return as &string

void fgetString(char *file, char *s);

• run shell coomad and return output as &string

void stdoutOneline(char *s_in, char *s_out);