first_attempt.c: In function ‘Solve_ODE’:
first_attempt.c:342:23: warning: passing argument 2 of ‘CVodeInit’ from incompatible pointer type [-Wincompatible-pointer-types]
  CVodeInit(cvode_mem, Cvode_rates, t, y);     // R: initialize solver; Cvode_ra
                       ^
In file included from first_attempt.h:11:0,
                 from first_attempt.c:15:
/usr/local/include/cvode/cvode.h:414:21: note: expected ‘CVRhsFn {aka int (*)(double,  struct _generic_N_Vector *, struct _generic_N_Vector *, void *)}’ but argument is of type ‘int (*)(realtype,  struct _generic_N_Vector *, struct _generic_N_Vector *) {aka int (*)(double,  struct _generic_N_Vector *, struct _generic_N_Vector *)}’
 SUNDIALS_EXPORT int CVodeInit(void *cvode_mem, CVRhsFn f, realtype t0, N_Vector
                     ^
first_attempt.c:369:25: warning: passing argument 2 of ‘CVodeInit’ from incompatible pointer type [-Wincompatible-pointer-types]
    CVodeInit(cvode_mem, Cvode_rates, t, y);             // and re-initialise th
                         ^
In file included from first_attempt.h:11:0,
                 from first_attempt.c:15:
/usr/local/include/cvode/cvode.h:414:21: note: expected ‘CVRhsFn {aka int (*)(double,  struct _generic_N_Vector *, struct _generic_N_Vector *, void *)}’ but argument is of type ‘int (*)(realtype,  struct _generic_N_Vector *, struct _generic_N_Vector *) {aka int (*)(double,  struct _generic_N_Vector *, struct _generic_N_Vector *)}’
 SUNDIALS_EXPORT int CVodeInit(void *cvode_mem, CVRhsFn f, realtype t0, N_Vector