Change value in a table

Hi experts,

How can I do this with an efficient ABAP code?

-I have to check the data contained in a column 1

-If I find values on column 1 staring with number 7 and ended with a letter (e.g 71233444B)

-Then I have to transform the value contained in column 2 by replacing it with the following conditions:

            -Take the value in column 1

            -Replace 7 by a ZERO

            -Replace the letter by à Zero

            -Add ‘01’ at the end

Below an example:

Actual values in table

Expected values after treatment

Thanks for your support.

Amine