https://manpages.ubuntu.com/manpages/xenial/man3/Tcl_Format.3tcl.html
Ubuntu Manpage: Tcl_NewStringObj, Tcl_NewUnicodeObj, Tcl_SetStringObj,
ubuntumanpagetcl
https://manpages.ubuntu.com/manpages/xenial/man3/Tcl_GetUnicode.3tcl.html
Ubuntu Manpage: Tcl_NewStringObj, Tcl_NewUnicodeObj, Tcl_SetStringObj,
ubuntumanpagetcl
https://manpages.ubuntu.com/manpages/xenial/man3/Tcl_ConcatObj.3tcl.html
Ubuntu Manpage: Tcl_NewStringObj, Tcl_NewUnicodeObj, Tcl_SetStringObj,
ubuntumanpagetcl
https://manpages.ubuntu.com/manpages/xenial/man3/Tcl_GetRange.3tcl.html
Ubuntu Manpage: Tcl_NewStringObj, Tcl_NewUnicodeObj, Tcl_SetStringObj,
ubuntumanpagetcl