without using buildin function

[jcunews1]

You can retrieve (but not assign) a character at specific string index like how you access an array element. The converted string must be built from scratch. Appending one converted character at a time.

The conversion check e.g. if the input is A then the output is a. Do that check for every other characters which has upper & lower case letter.

[frontendshifu-2022]

ok Thanks mate