from libc.stdlib cimport free
from c_func cimport get_a_c_string


def main():
    cdef char* c_string = NULL
    cdef Py_ssize_t length = 0

    # get pointer and length from a C function
    get_a_c_string(&c_string, &length)

    try:
        py_bytes_string = c_string[:length]  # Performs a copy of the data
    finally:
        free(c_string)