Wrote program for Day 6

Week-01/Day-06_Next-Prime/next_prime/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "next_prime"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

Week-01/Day-06_Next-Prime/next_prime/src/lib.rs

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+pub fn next_prime(num: usize) -> Option<usize> {
+    let max_next_prime = num * 2;
+    let mut is_prime: Vec<bool> = vec![true; max_next_prime];
+
+    for i in 2..max_next_prime {
+        for j in (i * 2..max_next_prime).step_by(i) {
+            is_prime[j] = false;
+        }
+
+        if i >= num && is_prime[i] {
+            return Some(i);
+        }
+    }
+
+    None
+}

Week-01/Day-06_Next-Prime/next_prime/src/main.rs

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+use next_prime::next_prime;
+use std::io::{self, Write};
+
+fn main() {
+    let mut buffer = String::new();
+
+    print!("Give me an integer, and I will return the first prime found from that: ");
+    io::stdout().flush().expect("Failed to flush stdout.");
+
+    io::stdin()
+        .read_line(&mut buffer)
+        .expect("Error while trying to read the number.");
+
+    let num: usize = buffer
+        .trim()
+        .parse()
+        .expect("The input inserted is not a valid integer");
+
+    match next_prime(num) {
+        Some(x) => println!("Here's the first prime found from {}: {}", num, x),
+        None => println!("None found"),
+    }
+}

Week-01/Day-06_Next-Prime/next_prime/tests/exaples.rs

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+use next_prime::next_prime;
+
+#[test]
+fn first_example() {
+    assert_eq!(next_prime(12), Some(13));
+}
+
+#[test]
+fn second_example() {
+    assert_eq!(next_prime(24), Some(29));
+}
+
+#[test]
+fn third_example() {
+    assert_eq!(next_prime(11), Some(11));
+}