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* add: solution to project euler problem 20 * Update curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md Accidentally added last line. Calling function is unnecessary in solution. Co-Authored-By: Oliver Eyton-Williams <ojeytonwilliams@gmail.com> * right place for starting braces Co-Authored-By: Manish Giri <manish.giri.me@gmail.com> * moved starting brace to previous line. Co-Authored-By: Manish Giri <manish.giri.me@gmail.com> Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com> Co-authored-by: Manish Giri <manish.giri.me@gmail.com>