How to write text on specific position in text file.

Question

I have to generate text file as above but value should be on specific position. above excel data coming from SP. first value will go as tc+960000000*cc then check 'find' it is 6 then check 'pos' it is 36 so 6 should be at position 36. then check find it is 111 then check pos it is 19 so 111 should go at 19 position. please help how can i achieve this.