tcl format - SERP Analysis

https://www.astro.princeton.edu/~rhl/Tcl-Tk_docs/tcl/format.n.html

https://www.tcl-lang.org/man/tcl8.4/TclCmd/format.htm

https://wiki.tcl-lang.org/page/format

https://stackoverflow.com/questions/60800711/how-to-format-a-number-string-in-tcl

https://www.oreilly.com/library/view/tcltk-in-a/9780596803520/re32.html

https://zetcode.com/tcl/format/

https://www.intel.com/content/www/us/en/support/programmable/support-resources/design-examples/quartus/date-time-format.html

https://clovertech.infor.com/forums/topic/tcl-use-a-variable-to-contain-list-of-arguments-for-format-command/

https://www.tutorialspoint.com/tcl-tk/tcl_strings.htm

http://www.gener8.be/site/articles/tcl_file_formats/tcl_file_formats.html

https://github.com/Starlink/tcl/blob/master/tests/format.test