Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed
arrows point from an interface to procedures which implement that interface.
This could include the module procedures in a generic interface or the
implementation in a submodule of an interface in a parent module.
function get_current_dtime()result(dt)!! Function to get the current \(\Delta t\)implicit nonereal(wp)::dt!! Returns \(\Delta t\).dt=dtimeend function get_current_dtime