Bloomberg Software Developer interview questions

(phone) Write a c function that takes a string and removes all duplicate whitespace, and only write to every char at most once. (Onsite 1.1) Implement a filesystem with only metadata (only filenames & structure) - they provide a simple shell that recognizes some simple unix commands (ls, mkdir, rm and something that doesn't exist in unix that just makes a file with a given name) and you must implement those functions with reasonable behaviour (no 2 files/directories with same name in a directory, ls prints alphabetically etc.) (Onsite 1.2) Take a list of strings and print a list of prefixes and their frequency (e.g. Input: Banana, Ban, Banal, Bat Output; B,4 Ba,4 Ban,3 Bana,2 Bat,1 etc.)

They asked me why did I want to apply to Bloomberg.