Merge pull request #20 from sir-gon/develop

[REFACTOR] Trying to re-organize source code and tests

Author: sir-gon

docs/hackerrank/warmup/solveMeFirst.md

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+# [Solve Me First](https://www.hackerrank.com/challenges/solve-me-first)
+
+Difficulty: #easy
+Category: #warmup
+
+Complete the function solveMeFirst to compute the sum of two integers.
+
+## Example
+
+$ a = 7 $ \
+$ b = 3 $
+
+Return 10.
+
+## Function Description
+
+Complete the solveMeFirst function in the editor below.
+solveMeFirst has the following parameters:
+
+- int a: the first value
+- int b: the second value
+
+## Constraints
+
+$ 1 \leq a, b \leq 1000 $
+
+## Sample Input
+
+```text
+a = 2
+b = 3
+```
+
+## Sample Output
+
+```text
+5
+```
+
+## Explanation
+
+```text
+2 + 3 = 5
+```

src/add.rs

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+pub mod warmup;

src/hackerrank/mod.rs

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+pub mod solve_me_first;

src/hackerrank/warmup/mod.rs

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+// @link Problem definition [[docs/hackerrank/warmup/solveMeFirst.md]]
+
+pub fn solve_me_first(left: i32, right: i32) -> i32 {
+    left + right
+}

src/hackerrank/warmup/solve_me_first.rs

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-pub mod add;
+pub mod hackerrank;

src/lib.rs

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+pub mod warmup;

tests/add.rs

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+pub mod solve_me_first;