Implement generateTriangle method

src/main/java/MainExercises.java

@@ -20,8 +20,22 @@ public class MainExercises
  */
     public char[][] generateTriangle(int n) {
 
-        // todo
-        return null;
+        char [][] triangle = new char[n][];
+
+        for(int i = 0; i < n; i++){
+            triangle[i] = new char[i + 1];
+            for(int j = 0; j <= i; j++){
+                if(i == 0 || j == 0 || i == n - 1 || j == i){
+                    triangle[i][j] = '*';
+                }
+                else{
+                    triangle[i][j] = ' ';
+                }
+            }
+        }
+
+
+        return triangle;
 
     }