use camel case

Author: EdwardAndress

data.json

@@ -1,16 +1,16 @@
 [
-  {"name": "Eiffel Tower", "mass_kg": 10100000},
-  {"name": "Statue of Liberty", "mass_kg": 204000},
-  {"name": "Saturn V rocket", "mass_kg": 2970000},
-  {"name": "Blue whale", "mass_kg": 150000},
-  {"name": "African elephant", "mass_kg": 6000},
-  {"name": "London double decker bus", "mass_kg": 12000},
-  {"name": "Boeing 747 max takeoff", "mass_kg": 447700},
-  {"name": "Grand piano", "mass_kg": 480},
-  {"name": "Horse", "mass_kg": 500},
-  {"name": "Human", "mass_kg": 70},
-  {"name": "Brick", "mass_kg": 2.5},
-  {"name": "Apple", "mass_kg": 0.18},
-  {"name": "Egg", "mass_kg": 0.06},
-  {"name": "Smartphone", "mass_kg": 0.2}
+  {"name": "Eiffel Tower", "massKg": 10100000},
+  {"name": "Statue of Liberty", "massKg": 204000},
+  {"name": "Saturn V rocket", "massKg": 2970000},
+  {"name": "Blue whale", "massKg": 150000},
+  {"name": "African elephant", "massKg": 6000},
+  {"name": "London double decker bus", "massKg": 12000},
+  {"name": "Boeing 747 max takeoff", "massKg": 447700},
+  {"name": "Grand piano", "massKg": 480},
+  {"name": "Horse", "massKg": 500},
+  {"name": "Human", "massKg": 70},
+  {"name": "Brick", "massKg": 2.5},
+  {"name": "Apple", "massKg": 0.18},
+  {"name": "Egg", "massKg": 0.06},
+  {"name": "Smartphone", "massKg": 0.2}
 ]