Hello,
one small code :
let you want to compare char of LV_str = 'kapilgoyal".
Calculate the length of LV_Str using strlen() into lv_len.
lv_str+0(1) will give you first left most char..
lv_str+1(1) will give you 2nd left most.
lv_str+ lv_len-1(1) last right most char.
lv_str+lv_len-2(1) 2nd last right char.
you can do the same thing in loop also... like assign some data in lv_loop and use it like this.
lv_str+lv_len-lv_loop(1)
just use if statement 