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docs(modify_letter): add description of the subject
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## modify_letter
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### Instructions
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Create a **function** `remove_letter_sensitive` that returns a string without the letter specified as argument
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Create a **function** `remove_letter_insensitive` that returns a string without the letter specified as argument (ignoring case)
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Create a **function** `swap_letter_case` that returns a string swapping the case for the chosen letter.
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### Expected Functions
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```rust
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pub fn remove_letter_sensitive(s: &str, letter: char) -> String {
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}
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pub fn remove_letter_insensitive(s: &str, letter: char) -> String {
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}
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pub fn swap_letter_case(s: &str, letter: char) -> String {
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}
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```
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### Usage
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Here is a program to test your functions.
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```rust
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use modify_letter::*modify_letter*;
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fn main() {
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println!("{}", remove_letter_sensitive("Joje jis mijssjing", "j"));
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println!("{}", remove_letter_insensitive("jaillA ais swiaAmmingA", "A"));
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println!("{}", swap_letter_case("hEllo therE", "e"));
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}
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```
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And its output
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```console
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$ cargo run
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Joe is missing
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Jill is swimming
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Hello thERe
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$
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```
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