Merge pull request #16 from saumya1317/feature/implement-grayscale

Implement grayscale filter function

Author: harshsankhla18

helpers.c

@@ -9,12 +9,21 @@ int max(int a,int b){
     return b;
 }
 void grayscale(int height, int width, RGBTRIPLE image[height][width]){
-    return;
-    
-// Convert image to grayscale
-
+   
+    for(int i = 0; i < height; i++){
+        for(int j = 0; j < width; j++){
+            int red = image[i][j].rgbtRed;
+            int green = image[i][j].rgbtGreen;
+            int blue = image[i][j].rgbtBlue;
+            int avg = (red + green + blue) / 3;
+            image[i][j].rgbtRed = avg;
+            image[i][j].rgbtGreen = avg;
+            image[i][j].rgbtBlue = avg;
+        }
+    }
 }
 
+
 void invert(int height, int width, RGBTRIPLE image[height][width]){
     for(int i = 0; i<height; i++){
         for(int j = 0; j<width; j++){