fix and test find_maxima function

hands_on/local_maxima/local_maxima.py

@@ -7,4 +7,14 @@ def find_maxima(x):
     Output:
     idx -- list of indices of the local maxima in x
     """
-    return []
+
+    local_maxima = []
+
+    for index, value in enumerate(x):
+        if index <= len(x)-2:
+            if x[index] > x[index+1] and x[index] > x[index-1]:
+                local_maxima.append(index)
+    
+    if len(local_maxima) > 0:
+        return local_maxima
+    

hands_on/local_maxima/test_local_maxima.py

@@ -0,0 +1,10 @@
+from local_maxima import find_maxima
+import pytest
+
+def test_find_maxima():
+    input_list = [0, 6, -2, 5, 1]
+    expected = [1, 3]
+
+    result = find_maxima(input_list)
+
+    assert result == expected