How to check spaces,camas(,) when writing formulafield using crystalreports?

Hi to all,
I have designed a one report using crystal reports.
in that i have written one formulafield for partyname ,combination of name,age,address
ex:srinivas,25,hyderabad

In this when i am not enter the age ,i am getting following way
Ex:srinivas, ,Hyderabad
 My requirement is i want to remove that camas(,) depending on data exist or not.

how to check this when writing formulafield