implementing naviagtion between functions

hi guys,
currently i have a calculator that has different functions, i have already made a function that points to other function based on the 'values' in a string defined in a struct in a header. it is proving to be very troublesome and i am wanting some thoughts on ways to implement navigation between functions of a console program.

This is basically how it is:

>>>MAIN(start) ---Input into string
>>> values read by naviagtion function
>>> requested function is run
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