Well, I really know how to make it right (it is not my code!). My point is that Fortran could make it better on its own, without forcing the programmer to make all housekeeping in memory (re)allocation. With such an attitude, we do not need array syntax (make a loop when needed), generic procedures, operator overloading (invoke the proper function when needed) and so on. People (including me) were using Fortran 77 without any of the modern features for decades, and did their jobs right.
Reallocation of memory in Fortran is just not optimal. Do not try to convince me that it is.