style: fix typos and remove redundant main mehtod

Co-authored-by: Andrii Siriak <[email protected]>

Author: vil02

src/main/java/com/thealgorithms/datastructures/trees/nearestRightKey.java

@@ -3,8 +3,8 @@
 import java.util.Scanner;
 import java.util.concurrent.ThreadLocalRandom;
 
-final class Main {
-    private Main() {
+final class NearestRightKey {
+    private NearestRightKey() {
     }
 
     public static void main(String[] args) {

src/main/java/com/thealgorithms/misc/Sparcity.java renamed to src/main/java/com/thealgorithms/misc/Sparsity.java

@@ -11,17 +11,17 @@
  * @author Ojasva Jain
  */
 
-final class Sparcity {
-    private Sparcity() {
+final class Sparsity {
+    private Sparsity() {
     }
 
     /*
-     * @return Sparcity of matrix
+     * @return Sparsity of matrix
      *
-     * where sparcity = number of zeroes/total elements in matrix
+     * where sparsity = number of zeroes/total elements in matrix
      *
      */
-    static double sparcity(double[][] mat) {
+    static double sparsity(double[][] mat) {
         int zero = 0;
         // Traversing the matrix to count number of zeroes
         for (int i = 0; i < mat.length; i++) {
@@ -31,7 +31,7 @@ static double sparcity(double[][] mat) {
                 }
             }
         }
-        // return sparcity
+        // return sparsity
         return ((double) zero / (mat.length * mat[1].length));
     }
 
@@ -50,7 +50,7 @@ public static void main(String[] args) {
                 mat[i][j] = in.nextDouble();
             }
         }
-        System.out.println("Sparcity of matrix is: " + sparcity(mat));
+        System.out.println("Sparsity of matrix is: " + sparsity(mat));
         in.close();
     }
 }

src/main/java/com/thealgorithms/others/PasswordGen.java

@@ -15,11 +15,6 @@ final class PasswordGen {
     private PasswordGen() {
     }
 
-    public static void main(String[] args) {
-        String password = generatePassword(8, 16);
-        System.out.print("Password: " + password);
-    }
-
     static String generatePassword(int min_length, int max_length) {
         Random random = new Random();
 

src/main/java/com/thealgorithms/others/RotateMatriceBy90Degree.java renamed to src/main/java/com/thealgorithms/others/RotateMatrixBy90Degrees.java

@@ -6,8 +6,8 @@
  */
 import java.util.Scanner;
 
-class Rotate_by_90_degree {
-    private Rotate_by_90_degree() {
+class Rotate_by_90_degrees {
+    private Rotate_by_90_degrees() {
     }
 
     public static void main(String[] args) {