feat(matrix_op): add multiplication

matrix_ops: add matrix multiply capability
chore(fmt): flatten crate directory
tests(ops): add tests for multiplication

src/tests/matrix_test_ops.rs

@@ -0,0 +1,45 @@
+use std::str::FromStr;
+
+use crate::{matrix::Matrix, error::ParseMatrixError};
+
+#[test]
+pub fn test_matrix_add() -> Result<(), ParseMatrixError> {
+    let m1 = Matrix::from_str("1,2,3\n4,5,6\n7,8,9")?;
+    let m2 = Matrix::from_str("1,1,1\n1,1,1\n1,1,1")?;
+    let t = Matrix::from_str("2,3,4\n5,6,7\n8,9,10")?;
+    assert_eq!(&m1 + &m2, t);
+    Ok(())
+}
+#[test]
+pub fn test_matrix_determinate() -> Result<(), ParseMatrixError> {
+    let m = Matrix::from_str("3,4\n5,6")?;
+    let det = 3 * 6 - 4 * 5;
+    assert_eq!(m.determinant(), det);
+    Ok(())
+}
+#[test]
+pub fn test_matrix_transposition() -> Result<(), ParseMatrixError> {
+    let m = Matrix::from_str("1,2,3\n4,5,6\n7,8,9")?;
+    let t = Matrix::from_str("1,4,7\n2,5,8\n3,6,9")?;
+    assert_eq!(m.transpose(), t);
+    Ok(())
+}
+#[test]
+pub fn test_matrix_mul() -> Result<(), ParseMatrixError> {
+    let m1 = Matrix::from_str("1,2\n1,2")?;
+    let m2 = Matrix::from_str("1,3\n2,4")?;
+    let m3 = Matrix::from_str("1,2\n3,4")?;
+    let m4 = Matrix::from_str("1\n2")?;
+    let t1 = Matrix::from_str("5,11\n5,11")?;
+    let t2 = Matrix::from_str("5\n11")?;
+    assert_eq!(&m1 * &m2, t1);
+    assert_eq!(&m3 * &m4, t2);
+    Ok(())
+}
+#[test]
+#[should_panic]
+pub fn test_matrix_add_bad_dimensions() -> () {
+    let bad = Matrix::from_str("1,1,1\n1,1,1").unwrap();
+    let add = Matrix::from_str("1,1\n1,1").unwrap();
+    let _ = &bad + &add;
+}