How to make the pattern

Question

abcdcba (no space )
abc cba (1 space )
ab ba (3 space)
a a(5space)
ab ba (3space)
abc cba(1space)
abcdcba (no space)

Answer 1

2n-1 lines ... (n) + (n-1)
/*print n lines first using similiar logic & last (n-1) lines by little modification in logic of 1st n lines
other smart ways also exist , but try with above approach first (simplest approach)*/

Answer 2

Can we know what have you tried to tackle the problem?

You may start by observing the indices of the missing characters and see if you can filter those values within the loop. 😉