No, it is not difficult. It is way more than that. It is frustrating and depressing according to my experience attempting to modernize a FORTRAN 77 codebase (I

No, it is not difficult. It is way more than that. It is frustrating and depressing according to my experience attempting to modernize a FORTRAN 77 codebase (I gave up finally). Navigating through a quagmire of GOTO statements felt like a desperate endeavor. It's hard to fathom how someone could work on such a project for three years, especially if it appears to be a solo effort. Upon examining the original FORTRAN code and accompanying papers, I realized that the complexity of the task was far from trivial. Working alone for three years, especially on such a complex codebase, requires a significant amount of dedication and perseverance.