Doubt in "pattern doublesided arrow" problem

#1

i am unable to print these spaces which i have indicated by a *
1
2 1 1 2
3 2 1 1 2 3
4 3 2 1 1 2 3 4
3 2 1 * * * 1 2 3
2 1 * 1 2
1

#2

Hey @Mukesh_1
Please share your code.

#3

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