Some solutions for the julia path

julia/annalyns-infiltration/README.md

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+# Annalyns Infiltration
+
+Welcome to Annalyns Infiltration on Exercism's Julia Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
+
+## Introduction
+
+## Booleans in Julia
+
+True or false values are represented by the `Bool` type.
+It contains only two values: `true` and `false`.
+
+```julia-repl
+julia> true
+true
+
+julia> false
+false
+```
+
+## Boolean Operators
+
+There are three Boolean operators in Julia.
+
+`&&` is Boolean "and".
+It evaluates to `true` if the expressions on *both* sides of `&&` are `true`.
+
+```julia-repl
+julia> true && true
+true
+
+julia> true && false
+false
+```
+
+`||` is Boolean "or".
+It evaluates to `true` if an expression on *either* side of `||` is `true`.
+
+```julia-repl
+julia> true || true
+true
+
+julia> false || true
+true
+```
+
+`!` is Boolean "not".
+It exchanges `true` and `false` values.
+
+```julia-repl
+julia> !true
+false
+
+julia> !false
+true
+```
+
+For longer and more complicated expressions, it is best to use parentheses to make your intention clear.
+
+```julia-repl
+julia> (true || false) && (false && true)
+false
+```
+
+## Instructions
+
+In this exercise, you'll be writing some logic for a video game a friend is developing.
+The game's main character is Annalyn, a brave girl with a fierce and loyal pet dog.
+Unfortunately, disaster strikes, as her best friend is kidnapped while searching for berries in the forest.
+Annalyn will try to find and free her friend, optionally taking her dog with her on this quest.
+
+Annalyn eventually finds the camp in which her friend is imprisoned and it turns out there are two kidnappers: a mighty knight and a cunning archer.
+
+The player is presented with some options for what to do next.
+For each of the four possible options you need to write a function that tells the game whether it should show that option or not.
+
+## 1. Check if the 'Fast Attack' option should be shown
+
+If the knight is sleeping, then Annalyn will be able to make a quick attack into the camp before he can wake up properly and get his armour on.
+
+Implement a function named `can_do_fast_attack` that takes a boolean value which indicates if the knight is awake.
+This function returns `true` if the 'Fast Attack' action is available based on the state of the character. Otherwise, returns `false`:
+
+```julia-repl
+julia> knight_awake = true
+
+julia> can_do_fast_attack(knight_awake)
+false
+```
+
+## 2. Check if the 'Spy' option should be shown
+
+The group can be spied upon if at least one of them is awake. Otherwise, spying is a waste of time.
+
+Implement a function named `can_spy` that takes three boolean values, indicating if the knight, archer and prisoner, respectively, are awake.
+The function returns `true` if the 'Spy' action is available based on the state of the characters.
+Otherwise, returns `false`:
+
+```julia-repl
+# Output suppressed from the next 3 lines
+julia> knight_awake = false
+julia> archer_awake = true
+julia> prisoner_awake = false
+
+julia> can_spy(knight_awake, archer_awake, prisoner_awake)
+true
+```
+
+## 3. Check if the 'Signal Prisoner' option should be shown
+
+The prisoner can be signalled using bird sounds if she is awake and the archer is sleeping.
+If the archer is awake then she can't be safely signaled because the archer is also trained in bird signalling.
+
+Implement a function named `can_signal_prisoner` that takes two boolean values, indicating if the archer and prisoner, respectively, are awake.
+The function returns `true` if the 'Signal Prisoner' action is available based on the state of the characters.
+Otherwise, returns `false`:
+
+```julia-repl
+julia> archer_awake = false
+julia> prisoner_awake = true
+
+julia> can_signal_prisoner(archer_awake, prisoner_awake)
+true
+```
+
+## 4. Check if the 'Free Prisoner' option should be shown
+
+Annalyn can try sneaking into the camp to free her friend. This is a risky thing to do and can only succeed in one of two ways:
+
+- If Annalyn has her pet dog with her, she can rescue the prisoner if the archer is asleep.
+  The knight is scared of the dog and the archer will not have time to get ready before Annalyn and her friend can escape.
+
+- If Annalyn does not have her dog then she and the prisoner must be very sneaky!
+  Annalyn can free the prisoner if she is awake and the knight and archer are both sleeping, but if the prisoner is sleeping, she can't be rescued: she would be startled by Annalyn's sudden appearance and wake up the knight and archer.
+
+Implement a function named `can_free_prisoner` that takes four boolean values.
+The first three parameters indicate if the knight, archer and prisoner, respectively, are awake.
+The last parameter indicates if Annalyn's pet dog is present.
+The function returns `true` if the 'Free Prisoner' action is available based on the state of the characters. Otherwise, it returns `false`:
+
+```julia-repl
+julia> knight_awake = false
+julia> archer_awake = true
+julia> prisoner_awake = false
+julia> dog_present = false
+
+julia> can_free_prisoner(knight_awake, archer_awake, prisoner_awake, dog_present)
+false
+```
+
+## Source
+
+### Created by
+
+- @SaschaMann
+- @colinleach
+
+### Contributed to by
+
+- @cmcaine
+- @BNAndras